US20110158292A1 - Transmitting spread signal in communication system - Google Patents

Transmitting spread signal in communication system Download PDF

Info

Publication number
US20110158292A1
US20110158292A1 US13/045,455 US201113045455A US2011158292A1 US 20110158292 A1 US20110158292 A1 US 20110158292A1 US 201113045455 A US201113045455 A US 201113045455A US 2011158292 A1 US2011158292 A1 US 2011158292A1
Authority
US
United States
Prior art keywords
antenna
antennas
nack information
ack
available neighboring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US13/045,455
Other versions
US8774297B2 (en
Inventor
Jung Hoon Lee
Ki Jun Kim
Dong Wook Roh
Dae Won Lee
Joon Kui Ahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to US13/045,455 priority Critical patent/US8774297B2/en
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHN, JOON KUI, KIM, KI JUN, LEE, DAE WON, LEE, JUNG HOON, ROH, DONG WOOK
Priority to US13/162,487 priority patent/US8792570B2/en
Publication of US20110158292A1 publication Critical patent/US20110158292A1/en
Priority to US13/757,695 priority patent/US8774299B2/en
Priority to US14/303,482 priority patent/US10742256B2/en
Application granted granted Critical
Publication of US8774297B2 publication Critical patent/US8774297B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0678Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different spreading codes between antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/068Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/204Multiple access
    • H04B7/216Code division or spread-spectrum multiple access [CDMA, SSMA]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606Space-frequency coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0016Time-frequency-code
    • H04L5/0021Time-frequency-code in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0026Division using four or more dimensions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems

Definitions

  • the present invention relates to a communication system, and more particularly, to transmitting a spread signal in a communication system.
  • diversity gain is obtained by additionally securing a spatial area for resource utilization with a plurality of antennas provided to a transceiver or raising transmission capacity by transmitting data in parallel via each antenna.
  • MIMO multiple input multiple output
  • the MIMO scheme indicates an antenna system having multiple inputs and outputs, raises a quantity of information by transmitting different information via each transmitting antenna, and enhances reliability of transport information using coding schemes such as STC (space-time coding), STBC (space-time block coding), SFBC (space-frequency block coding) and the like.
  • STC space-time coding
  • STBC space-time block coding
  • SFBC space-frequency block coding
  • the present invention is directed to transmitting a spread signal in a mobile communication system.
  • the present invention is embodied in a method for transmitting a spread signal in a mobile communication system, the method comprising spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.
  • the multiplexed signal is transmitted on four neighboring frequency resources.
  • the spreading factor is 4.
  • the spreading factor is equal to the number of neighboring frequency resources.
  • the first antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol, wherein the first antenna set comprises two antennas.
  • the second antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol, wherein the second antenna set comprises two antennas.
  • the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different frequency resources.
  • the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different OFDM symbols.
  • the multiplexed signal is transmitted alternately by the first antenna set and second antenna set via independent frequency resources repeatedly.
  • the multiplexed signal is transmitted a total of 3 times using the first antenna set and second antenna set alternately.
  • the first antenna set comprises a first antenna and a second antenna of a four-antenna group
  • the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.
  • the first antenna set comprises a first antenna and a third antenna of a four-antenna group
  • the second antenna set comprises a second antenna and a fourth antenna of the four-antenna group.
  • FIG. 1 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme in a communication system in accordance with one embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 4 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 6 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention, in which an SFBC/FSTD scheme is applied to the spread signal.
  • FIG. 9 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 10 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 11 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 12 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 13 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to at least one spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 14 is a diagram illustrating an example of a method for transmitting a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • FIG. 15 is a diagram illustrating an example of a method for receiving a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • the present invention relates to transmitting a spread signal in a wireless communication system.
  • the base station has a meaning of a terminal node of a network, which directly performs communication with the terminal.
  • a specific operation described as performed by a base station can be carried out by an upper node of the base station.
  • a network which includes a plurality of network nodes including a base station, for the communication with a terminal can be carried out by the base station or other network nodes except the base station.
  • Base station can be replaced by such a terminology as a fixed station, Node B, eNode B (eNB), access point and the like.
  • terminal can be replaced by such a terminology as UE (user equipment), MS (mobile station), MSS (mobile subscriber station) and the like.
  • FIG. 1 is a diagram illustrating an example of a method of applying an SFBC/FSTD scheme in a wireless communication system, in accordance with one embodiment of the present invention.
  • a method for obtaining 4-degree transmitting antenna diversity is implemented using a plurality of transmitting antennas, e.g., four downlink transmitting antennas of a communication system.
  • two modulation signals transmitted via two adjacent subcarriers are transmitted via a first antenna set including two antennas by having space frequency block coding (SFBC) applied thereto.
  • SFBC-coded subcarrier sets are transmitted via two different antenna sets each including two different antennas by having frequency switching transmit diversity (FSTD) applied thereto.
  • FSTD frequency switching transmit diversity
  • a single small box indicates a single subcarrier transmitted via a single antenna.
  • the letters “a”, “b”, “c” and “d” represent modulation symbols modulated into signals differing from each other.
  • functions f 1 (x), f 2 (x), f 3 (x) and f 4 (x) indicate random SFBC functions that are applied to maintain orthogonality between two signals. These functions can be represented as in Equation 1.
  • FIG. 1 shows a structure that SFBC and FSTD transmitted in downlink within a random time unit is repeated.
  • modulated symbol sets (a, b), (c, d), (e, f) and (g, h) become an SFBC-coded set, respectively.
  • FIG. 1 shows that subcarriers having SFBC/FSTD applied thereto are consecutive. However, the subcarriers having SFBC/FSTD applied thereto may not necessarily be consecutive in a frequency domain. For instance, a subcarrier carrying a pilot signal can exist between SFBC/FSTD applied subcarriers. Yet, two subcarriers constructing an SFBC coded set are preferably adjacent to each other in a frequency domain so that wireless channel environments covered by a single antenna for two subcarriers can become similar to each other. Hence, when SFBC decoding is performed by a receiving side, it is able to minimize interference mutually affecting the two signals.
  • an SFBC/FSTD scheme may be applied to a spread signal sequence.
  • a plurality of spread signals may be transmitted by a code division multiplexing (CDM) scheme.
  • CDM code division multiplexing
  • the signal a and the signal b are transformed into spread signal sequences (a ⁇ c 11 , a ⁇ c 21 ) and (b ⁇ c 12 , bc 22 ) using (pseudo) orthogonal spreading codes of two chip lengths (c 11 , c 21 ) and (c 12 , c 22 ), respectively.
  • the spread signal sequences are modulated by adding a ⁇ c 11 +b ⁇ c 12 and a ⁇ c 21 +bc 22 to two subcarriers, respectively.
  • a ⁇ c 11 +b ⁇ c 12 and a ⁇ c 21 +bc 22 become modulated symbols, respectively.
  • FIG. 2 is a diagram illustrating an example of a method of applying an SFBC/FSTD scheme to a spread signal in a communication system, in accordance with one embodiment of the present invention.
  • each chip of a received spread signal sequence undergo a similar wireless channel response.
  • a received signal in each subcarrier can be represented as in Equation 2.
  • Subcarrier 1 h 1 (a 1 +b 1 +c 1 +d 1 ) ⁇ h 2 (a 2 +b 2 +c 2 +d 2 )*
  • Subcarrier 2 h 1 (a 2 +b 2 +c 2 +d 2 )+h 2 (a 1 +b 1 +c 1 +d 1 )*
  • Subcarrier 3 h 3 (a 3 +b 3 +c 3 +d 3 ) ⁇ h 4 (a 4 +b 4 +c 4 +d 4 )*
  • Equation 2 h i indicates fading undergone by an i th antenna. Preferably, subcarriers of the same antenna undergo the same fading. A noise component added to a receiving side may be ignored. And, a single receiving antenna preferably exists. In this case, spread sequences obtained by a receiving side after completion of SFBC decoding and FSTD decoding can be represented as in Equation 3.
  • the wireless channel responses for the four chips is preferably the same.
  • signals transmitted via different antenna sets by FSTD are (h 1
  • one embodiment of the present invention is directed to a method of transmitting at least one spread signal in a communication system, wherein each of at least one signal is spread by (pseudo) orthogonal code or the like with a spreading factor (SF), and wherein the at least one spread signal is multiplexed by CDM and transmitted via the same antenna set.
  • FIG. 3 is a diagram illustrating an example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • the at least one spread signal is multiplexed and transmitted by CDM, and the multiplexed signals are transmitted via the same antenna set.
  • a first antenna set when a total of four transmitting antennas are used, a first antenna set includes a first antenna and a second antenna.
  • a second antenna set includes a third antenna and a fourth antenna.
  • each of the first and second antenna sets is the antenna set for performing SFBC coding, and an FSTD scheme is applicable between the two antenna sets.
  • FIG. 3( a ) shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set.
  • FIG. 3( b ) shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • FIG. 4 is a diagram illustrating another example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • the at least one spread signal is multiplexed and transmitted by CDM, and the multiplexed signals are transmitted via the same antenna set.
  • a first antenna set includes a first antenna and a third antenna.
  • a second antenna set includes a second antenna and a fourth antenna.
  • FIG. 4 shows a case of using a different method for constructing each antenna set but applying the same SFBC/FSTD scheme.
  • FIG. 4( a ) shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set.
  • FIG. 4( b ) shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • FIG. 5 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with an embodiment of the present invention.
  • a same signal can be repeatedly transmitted to obtain additional diversity.
  • the present embodiment relates to a case where the same signal is repeatedly transmitted at least twice via different subcarriers on a frequency axis, i.e., for a period of the same time unit.
  • FIG. 5( a ) shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 3 .
  • FIG. 5( b ) shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 4 .
  • FIG. 5( a ) and FIG. 5( b ) show examples for applying the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity gain using eight neighbor subcarriers, respectively.
  • FIG. 5( a ) and FIG. 5( b ) differ from each other with respect to the antennas included in the first and second antenna sets, each use the same method in applying the present embodiment.
  • FIG. 6 is a diagram illustrating another example for a method of applying a SFBC/FSTD scheme to a spread signal in a communication system in accordance with an embodiment of the present invention.
  • an antenna set is determined by a 4-subcarrier unit to enable the signal spread according to the aforesaid embodiment to be transmitted via the same antenna set.
  • the signal is repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply SFBC/FSTD for obtaining 4-degree transmitting antenna diversity.
  • subcarriers through which a spread signal sequence is multiplexed and transmitted include subcarriers that neighbor each other.
  • a one-time transmission may be performed using only four of eight subcarriers to which the SFBC/FSTD scheme is applied in the embodiment shown in FIG. 5 using a first antenna set. Subsequently, the one-time transmission is performed using four of eight subcarriers to which the SFBC/FSTD scheme is applied using a second antenna set. Accordingly, in order to implement the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity, an antenna set different from that of a previous transmission is used.
  • FIG. 6( a ) shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 3 .
  • FIG. 6( b ) shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 4 .
  • FIG. 6( a ) and FIG. 6( b ) differ from each other with respect to the antennas included in the first and second antenna sets, each use the same method in applying the present embodiment.
  • the embodiment of FIG. 6 may considerably save resources required for the repetitive transmission by reducing additionally used resources in half. Therefore, if the repetitive transmission method according to FIG. 6 is applied, resources used for data transmission are used more efficiently.
  • CDM and SFBC/FSTD schemes may be applied to a spread signal for an ACK/NAK signal transmitted in downlink to announce the successful/failed reception of data transmitted in uplink.
  • FIG. 7 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention.
  • each small box indicates a resource element (RE) constructed with a single OFDM symbol and a single subcarrier.
  • a ij may indicate an ACK/NAK signal multiplexed by CDM, wherein “i” indicates an index of a signal spread and then multiplexed, and “j” indicates an ACK/NAK channel index of the multiplexed ACK/NAK signal.
  • an ACK/NAK channel indicates a set of multiplexed ACK/NAK signals.
  • a plurality of ACK/NAK channels may exist according to necessity and resource situation of each system. However, for clarity and convenience of description, a single ACK/NAK channel exists in FIG. 7 .
  • FIG. 7( a ) shown is an example where a multiplexed ACK/NAK signal is transmitted via a single OFDM symbol.
  • a single OFDM symbol is used for the ACK/NAK signal transmission, diversity gain on a time axis may not be obtained.
  • four repetitive transmissions of the ACK/NAK signal multiplexed by CDM may be carried out along a frequency axis.
  • the four-time repetitive transmission exemplifies repetition to obtain diversity.
  • a repetition count may vary according to a channel status and/or a resource status of a system.
  • FIG. 7( b ) shown is an example where a multiplexed ACK/NAK signal is transmitted via a plurality of OFDM symbols.
  • the ACK/NAK signal may be repetitively transmitted using a single OFDM symbol for the increased OFDM symbols as it is.
  • transmission is performed to maximize use of subcarriers that are not overlapped with former subcarriers used for the first OFDM symbol. This is preferable considering a frequency diversity effect.
  • FIG. 7( b ) shown is a case where the number of ACK/NAK signals transmittable despite the increased number of OFDM symbols is equal to the case where a single OFDM symbol is used.
  • an ACK/NAK signal was transmitted repeatedly only on a frequency axis when using a single OFDM symbol.
  • more time-frequency resources may be used for transmitting the same number of ACK/NAK signals as in the single OFDM symbol case by substantially incrementing the repetition count of time-frequency.
  • OFDM symbols used for the ACK/NAK transmission are increased, more signal power used for the ACK/NAK transmission can be allocated.
  • the ACK/NAK signal may be transmitted to a cell having a wider area.
  • FIG. 7( c ) shown is another example where multiplexed ACK/NAK signals are transmitted via a plurality of OFDM symbols.
  • the transmission may be carried out by reducing the frequency-axis repetition count of the ACK/NAK signal multiplexed by CDM.
  • CDM frequency-axis repetition count
  • FIG. 7( c ) Compared with the transmission method shown in FIG. 7( b ), four time-frequency axis transmission repetitions of the ACK/NAK signal are reduced to two transmission repetitions in FIG. 7( c ). However, because the number of OFDM symbols used for the ACK/NAK signal transmission is incremented, the transmission method shown in FIG. 7( c ) is similar to the method shown in FIG. 7( a ), where a single OFDM symbol is used, because four time-frequency resource areas are available in both the methods shown in FIGS. 7( a ) and 7 ( c ).
  • the method shown in FIG. 7( c ) may reduce the signal power for ACK/NAK channel transmission because the number of time-frequency resource areas used for a single ACK/NAK channel transmission is reduced. Moreover, because the ACK/NAK channel is transmitted across the time-frequency areas, per-symbol transmission power allocation may be performed more efficiently than transmission over a single OFDM symbol only.
  • ACK/NAK signals are repetitively transmitted in the same structure for all OFDM symbols to simplify a system's scheduling operation, such as when the time-frequency resources shown in FIG. 7( b ) are used for example, different ACK/NAK channels may be transmitted. In particular, because double ACK/NAK channels are transmittable, more efficient resource use is achieved.
  • a spreading factor for multiplexing a plurality of ACK/NAK signals, a repetition count in time-frequency domain and the number of OFDM symbols for ACK/NAK signal transmission which are explained with reference to FIG. 7 , are exemplarily provided for a more accurate description of the present invention. It is understood that different spreading factors, different repetition counts and various OFDM symbol numbers are applicable to the present invention.
  • the embodiments shown in FIG. 7 may relate to using a single transmitting antenna that does not use transmitting antenna diversity, but may also be applicable to a 2-transmitting antenna diversity method, 4-transmitting antenna diversity method, and the like.
  • FIG. 8 is a diagram illustrating an example of a method for transmitting spread signals via a plurality of OFDM symbols in accordance with one embodiment of the present invention, in which an SFBC/FSTD scheme is applied to the spread signal.
  • a 4-degree transmitting antenna diversity method using a total of four transmitting antennas is implemented.
  • a single ACK/NAK channel exists for clarity and convenience of description.
  • an SFBC/FSTD scheme is applied to a spread signal using four transmitting antennas, and the signal is transmitted for a plurality of OFDM symbols.
  • the ACK/NAK signal may be repetitively transmitted using a single OFDM symbol for the increased OFDM symbols as it is.
  • this process is similar to the process described with reference to FIG. 7( b ).
  • a repetitive transmission is performed for a second OFDM symbol, it is carried out using an antenna set different from an antenna set used for a first OFDM symbol.
  • a transmission for a first OFDM symbol is performed using a first antenna set including a first antenna and a third antenna
  • a transmission for a second OFDM symbol can be performed using a second antenna set including a second antenna and a fourth antenna.
  • the transmission for the second OFDM symbol is carried out by maximizing use of subcarriers not overlapped with former subcarriers used for the first OFDM symbol. This is preferable to achieve a frequency diversity effect.
  • FIG. 8( b ) shown is another example of applying an SFBC/FSTD scheme to a spread signal using four transmitting antennas and transmitting the signal for a plurality of OFDM symbols in accordance with one embodiment of the present invention.
  • the signal when the number of OFDM symbols for ACK/NAK signal transmission is set to 2, the signal may be transmitted by reducing a frequency-axis repetition count of the ACK/NAK signal multiplexed by CDM.
  • this process is similar to the method described with reference to FIG. 7( c ).
  • the transmission will be performed using an antenna set different from the antenna set used for the first OFDM symbol.
  • FIG. 9 is a diagram illustrating an example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • a first antenna set includes a first antenna and second antenna
  • a second antenna set includes a third antenna and fourth antenna.
  • each of the first and second antenna sets is an antenna set for performing SFBC coding and an FSTD scheme applicable between the two antenna sets.
  • FIG. 9( a ) shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set.
  • FIG. 9( b ) shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • the same structure as applying an SFBC/FSTD scheme by 4-subcarrier unit for a CDM-multiplexed signal may be used, but without considering spreading as in FIG. 1 .
  • FIG. 10 is a diagram for illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention.
  • the at least one or more spread signals are also multiplexed and transmitted by CDM.
  • the multiplexed signals are transmitted via the same antenna set.
  • FIG. 10 unlike FIG. 9 , when a total of four transmitting antennas are used, a first antenna set includes a first antenna and third antenna, and a second antenna set includes a second antenna and fourth antenna.
  • FIG. 10 illustrates use of a different method for constructing each antenna set but applies the same SFBC/FSTD scheme.
  • FIG. 10( a ) shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set.
  • FIG. 10( b ) shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • the same structure as applying SFBC/FSTD by 4-subcarrier unit for a CDM-multiplexed signal may be used without considering spreading as in FIG. 1 .
  • FIG. 11 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention.
  • a same signal can be repeatedly transmitted to obtain additional diversity.
  • the same signal may be repeatedly transmitted at least once via different subcarriers on a frequency axis, i.e., for a period of the same time unit.
  • FIG. 11( a ) shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 9 .
  • FIG. 11( b ) shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 10 .
  • FIG. 11( a ) and FIG. 11( b ) illustrate examples for applying the SFBC/FSTD scheme using four neighbor subcarriers, respectively.
  • FIGS. 11( a ) and 11 ( b ) differ from each other with respect to the antennas included in the first and second antenna sets, but use the same method in applying the described embodiment.
  • FIG. 12 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention.
  • an antenna set is determined by 2-subcarrier unit to enable the spread signals to be transmitted via the same antenna set.
  • the signal may be repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply the SFBC/FSTD scheme for obtaining the 4-degree transmitting antenna diversity.
  • the embodiment of FIG. 12 uses a subcarrier having a prescribed interval by comparing a subcarrier used for repetitive transmission to that of a previous transmission.
  • subcarriers through which a spread signal sequence is multiplexed and transmitted include subcarriers that neighbor each other.
  • FIG. 12( a ) shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 9 .
  • FIG. 12( b ) shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 10 .
  • FIGS. 12( a ) and 12 ( b ) differ from each other with respect to the antennas included in the first and second antenna sets but use the same method in applying the described embodiment.
  • FIG. 12 may be described as follows. First, a one-time transmission is first performed using two of four subcarriers to which an SFBC/FSTD scheme is applied. The one-time transmission is then carried out using two of four subcarriers to which a next SFBC/FSTD scheme is applied. In this case, an antenna set different from that of a previous transmission is used to implement the SFBC/FSTD scheme.
  • FIG. 13 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to at least one spread signal in a communication system in accordance with one embodiment of the present invention.
  • an antenna-frequency mapping structure according to the SFBC/FSTD transmission scheme shown in FIG. 1 is maintained collectively for each OFDM symbol or subframe on a system, then the rest of an SFBC antenna set unused in the SFBC/FSTD scheme of FIG. 12 may be used for another data transmission.
  • a second antenna set other than a first antenna set to be SFBC-coded can be used to transmit another multiplexed signal.
  • the multiplexed signals may respectively be transmitted through the different antenna sets.
  • a first multiplexed signal is transmitted via first antenna set and a second multiplexed signal is transmitted via second antenna set.
  • mapping between a multiplexed signal and an antenna is changed. Accordingly, the second multiplexed signal will be transmitted via the first antenna set, while the first multiplexed signal is transmitted via the second antenna set.
  • the mapping between the multiplexed signal and the antenna is changed again to perform the corresponding transmission.
  • the first multiplexed signal will again be transmitted via first antenna set and the second multiplexed signal will again be transmitted via second antenna set. Accordingly, if transmission is performed in the above-mentioned manner, resources are efficiently used.
  • the antenna-frequency mapping structure in the SFBC/FSTD scheme described with reference to FIG. 1 will be maintained.
  • using a single OFDM symbol is merely exemplary for illustrating the present invention.
  • the present embodiment is applicable to a case of using several OFDM symbols.
  • repetition on a time axis as well as a frequency axis is applicable to obtain diversity in addition to transmitting antenna diversity.
  • the above embodiments are provided to explain applications of the present invention and are also applicable to a system using an SFBC/FSTD transmission diversity method regardless of various spreading factors (SF), various OFDM symbols numbers and repetition counts on time and frequency axes.
  • SF spreading factors
  • FIG. 14 is a diagram illustrating an example of a method for transmitting a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • a transmitting end spreads a signal using a plurality of spreading codes (S 1402 ).
  • the plurality of spreading codes have a spreading factor of 4.
  • the transmitting end codes the spread signal for multiple antenna transmission (S 1404 ).
  • the transmitting end multiplexes the coded spread signal by code division multiplexing per each antenna (S 1406 ).
  • the transmitting end transmits the multiplexed signal via four neighboring frequency resources of one OFDM symbol of a first antenna set consisting of two antennas (S 1408 ).
  • the transmitting end transmits the same multiplexed signal via four neighboring frequency resources of one OFDM symbol of a second antenna set consisting of two antennas (S 1410 ).
  • the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different OFDM symbols.
  • the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are separated from each other in a frequency domain.
  • FIG. 15 is a diagram illustrating an example of a method for receiving a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • a receiving end receives multiplexed signal via four neighboring frequency resources of one OFDM symbol, the multiplexed signal being transmitted from a first antenna set consisting of two antennas of a transmitting end (S 1502 ).
  • the receiving end receives the same multiplexed signal via four neighboring frequency resources of one OFDM symbol, the same multiplexed signal being transmitted from a second antenna set consisting of two antennas of the transmitting end (S 1504 ).
  • the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted from the transmitting end via respectively different OFDM symbols.
  • the multiplexed signal is obtained at the transmitting end from a coded spread signal using code division multiplexing per each antenna.
  • the coded spread signal is obtained at the transmitting end by coding a spread signal between the two antennas in the first antenna set and the second antenna set.
  • Embodiments of the present invention can be implemented by various means, e.g., hardware, firmware, software, and any combination thereof.
  • a method of transmitting a spread signal in a communication system can be implemented by at least one of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processor a controller, a microcontroller, a microprocessor, etc.
  • a method of transmitting a spread signal in a communication system can be implemented by a module, procedure, function and the like capable of performing the above mentioned functions or operations.
  • Software code is stored in a memory unit and can be driven by a processor.
  • the memory unit is provided within or outside the processor to exchange data with the processor by various means known in public.

Abstract

The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 12/139,254, filed on Jun. 13, 2008, which claims the benefit of earlier filing date and right of priority to Korean Patent Application No. 10-2007-122986, filed on Nov. 29, 2007, and U.S. Provisional Application Ser. Nos. 60/943,783, filed on Jun. 13, 2007, 60/955,019, filed on Aug. 9, 2007, 60/976,487, filed on Oct. 1, 2007, 60/982,435, filed on Oct. 25, 2007, and 60/983,234, filed on Oct. 29, 2007, the contents of which are hereby incorporated by reference herein in their entirety.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a communication system, and more particularly, to transmitting a spread signal in a communication system.
  • 2. Discussion of the Related Art
  • Recently, the demand for wireless communication services has risen abruptly due to the generalization of information communication services, the advent of various multimedia services and the appearance of high-quality services. To actively cope with the demand, a communication system's capacity should first be increased. In order to do so, methods for finding new available frequency bands and raising the efficiency of given resources in wireless communication environments are considered.
  • Much effort and attention has been made to research and develop multi-antenna technology. Here, diversity gain is obtained by additionally securing a spatial area for resource utilization with a plurality of antennas provided to a transceiver or raising transmission capacity by transmitting data in parallel via each antenna.
  • An example of a multi-antenna technology is a multiple input multiple output (MIMO) scheme. The MIMO scheme indicates an antenna system having multiple inputs and outputs, raises a quantity of information by transmitting different information via each transmitting antenna, and enhances reliability of transport information using coding schemes such as STC (space-time coding), STBC (space-time block coding), SFBC (space-frequency block coding) and the like.
  • SUMMARY OF THE INVENTION
  • The present invention is directed to transmitting a spread signal in a mobile communication system.
  • Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
  • To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the present invention is embodied in a method for transmitting a spread signal in a mobile communication system, the method comprising spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.
  • Preferably, the multiplexed signal is transmitted on four neighboring frequency resources. Preferably, the spreading factor is 4. Alternatively, the spreading factor is equal to the number of neighboring frequency resources.
  • In one aspect of the present invention, the first antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol, wherein the first antenna set comprises two antennas. Moreover, the second antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol, wherein the second antenna set comprises two antennas.
  • Preferably, the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different frequency resources. Preferably, the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different OFDM symbols.
  • In another aspect of the present invention, the multiplexed signal is transmitted alternately by the first antenna set and second antenna set via independent frequency resources repeatedly. Preferably, the multiplexed signal is transmitted a total of 3 times using the first antenna set and second antenna set alternately.
  • In one aspect of the present invention, the first antenna set comprises a first antenna and a second antenna of a four-antenna group, and the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.
  • In another aspect of the present invention, the first antenna set comprises a first antenna and a third antenna of a four-antenna group, and the second antenna set comprises a second antenna and a fourth antenna of the four-antenna group.
  • It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. Features, elements, and aspects of the invention that are referenced by the same numerals in different figures represent the same, equivalent, or similar features, elements, or aspects in accordance with one or more embodiments.
  • FIG. 1 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme in a communication system in accordance with one embodiment of the present invention.
  • FIG. 2 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 4 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 6 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention, in which an SFBC/FSTD scheme is applied to the spread signal.
  • FIG. 9 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 10 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 11 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 12 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 13 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to at least one spread signal in a communication system in accordance with one embodiment of the present invention.
  • FIG. 14 is a diagram illustrating an example of a method for transmitting a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • FIG. 15 is a diagram illustrating an example of a method for receiving a spread signal in a mobile communication system in accordance with one embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The present invention relates to transmitting a spread signal in a wireless communication system.
  • Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. It is to be understood that the following detailed description of the present invention is exemplary and explanatory and is intended to provide further explanation of the invention as claimed. The following detailed description includes details to provide complete understanding of the present invention. Yet, it is apparent to those skilled in the art that the present invention can be embodied without those details. For instance, predetermined terminologies are mainly used for the following description, need not to be limited, and may have the same meaning in case of being called arbitrary terminologies.
  • To avoid vagueness of the present invention, the structures or devices known in public are omitted or depicted as a block diagram and/or flowchart focused on core functions of the structures or devices. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
  • For the following embodiments, elements and features of the present invention are combined in prescribed forms. Each of the elements or features should be considered as selective unless there is separate and explicit mention. Each of the elements or features can be implemented without being combined with others. And, it is able to construct an embodiment of the present invention by combining partial elements and/or features of the present invention. The order of operations explained in the following embodiments of the present invention can be changed. Some partial configurations or features of a prescribed embodiment can be included in another embodiment and/or may be replaced by corresponding configurations or features of another embodiment.
  • In this disclosure, embodiments of the present invention are described mainly with reference to data transmitting and receiving relations between a base station and a terminal. In this case, the base station has a meaning of a terminal node of a network, which directly performs communication with the terminal. In this disclosure, a specific operation described as performed by a base station can be carried out by an upper node of the base station. Namely, it is understood that various operations carried out by a network, which includes a plurality of network nodes including a base station, for the communication with a terminal can be carried out by the base station or other network nodes except the base station. “Base station” can be replaced by such a terminology as a fixed station, Node B, eNode B (eNB), access point and the like. And, “terminal” can be replaced by such a terminology as UE (user equipment), MS (mobile station), MSS (mobile subscriber station) and the like.
  • FIG. 1 is a diagram illustrating an example of a method of applying an SFBC/FSTD scheme in a wireless communication system, in accordance with one embodiment of the present invention. In FIG. 1, a method for obtaining 4-degree transmitting antenna diversity is implemented using a plurality of transmitting antennas, e.g., four downlink transmitting antennas of a communication system. Here, two modulation signals transmitted via two adjacent subcarriers are transmitted via a first antenna set including two antennas by having space frequency block coding (SFBC) applied thereto. Two SFBC-coded subcarrier sets are transmitted via two different antenna sets each including two different antennas by having frequency switching transmit diversity (FSTD) applied thereto. As a result, a transmitting antenna diversity degree 4 can be obtained.
  • Referring to FIG. 1, a single small box indicates a single subcarrier transmitted via a single antenna. The letters “a”, “b”, “c” and “d” represent modulation symbols modulated into signals differing from each other. Moreover, functions f1(x), f2(x), f3(x) and f4(x) indicate random SFBC functions that are applied to maintain orthogonality between two signals. These functions can be represented as in Equation 1.

  • f 1(x)=x, f 2(x)=x, f 3(x)=−x*, f 4(x)=x*  [Equation 1]
  • Despite two signals being simultaneously transmitted via two antennas through the random SFBC function applied to maintain orthogonality between the two signals, a receiving side may be able to obtain an original signal by decoding each of the two signals. In particular, FIG. 1 shows a structure that SFBC and FSTD transmitted in downlink within a random time unit is repeated. By applying a simple reception algorithm that the same SFBC decoding and FSTD decoding are repeated in a receiving side through the structure of SFBC and FSTD repeating transmissions, decoding complexity is reduced and decoding efficiency is raised.
  • In the example shown in FIG. 1, modulated symbol sets (a, b), (c, d), (e, f) and (g, h) become an SFBC-coded set, respectively. FIG. 1 shows that subcarriers having SFBC/FSTD applied thereto are consecutive. However, the subcarriers having SFBC/FSTD applied thereto may not necessarily be consecutive in a frequency domain. For instance, a subcarrier carrying a pilot signal can exist between SFBC/FSTD applied subcarriers. Yet, two subcarriers constructing an SFBC coded set are preferably adjacent to each other in a frequency domain so that wireless channel environments covered by a single antenna for two subcarriers can become similar to each other. Hence, when SFBC decoding is performed by a receiving side, it is able to minimize interference mutually affecting the two signals.
  • In accordance with one embodiment of the present invention, an SFBC/FSTD scheme may be applied to a spread signal sequence. In a manner of spreading a single signal into a plurality of subcarriers through (pseudo) orthogonal code in a downlink transmission, a plurality of spread signals may be transmitted by a code division multiplexing (CDM) scheme.
  • For example, when attempting to transmit different signals “a” and “b”, if the two signals are to be CDM-transmitted by being spread by a spreading factor (SF) 2, the signal a and the signal b are transformed into spread signal sequences (a·c11, a·c21) and (b·c12, bc22) using (pseudo) orthogonal spreading codes of two chip lengths (c11, c21) and (c12, c22), respectively. The spread signal sequences are modulated by adding a·c11+b·c12 and a·c21+bc22 to two subcarriers, respectively. Namely, a·c11+b·c12 and a·c21+bc22 become modulated symbols, respectively. For clarity and convenience, the spread signal sequence resulting from spreading the signal a by SF=N is denoted as a1, a2, . . . , aN.
  • FIG. 2 is a diagram illustrating an example of a method of applying an SFBC/FSTD scheme to a spread signal in a communication system, in accordance with one embodiment of the present invention. In order to decode a signal spread over a plurality of subcarriers by despreading in a receiving side, as mentioned in the foregoing description, it is preferable that each chip of a received spread signal sequence undergo a similar wireless channel response. In FIG. 2, four different signals a, b, c and d are spread by SF=4 and the spread signals are transmitted by SFBC/FSTD through four subcarriers explained in the foregoing description of FIG. 1. Assuming that the function explained for the example in Equation 1 is used as an SFBC function, a received signal in each subcarrier can be represented as in Equation 2.

  • Subcarrier 1: h1(a1+b1+c1+d1)−h2(a2+b2+c2+d2)*

  • Subcarrier 2: h1(a2+b2+c2+d2)+h2(a1+b1+c1+d1)*

  • Subcarrier 3: h3(a3+b3+c3+d3)−h4(a4+b4+c4+d4)*

  • Subcarrier 4: h3(a4+b4+c4+d4)+h4(a3+b3+c3+d3)*  [Equation 2]
  • In Equation 2, hi indicates fading undergone by an ith antenna. Preferably, subcarriers of the same antenna undergo the same fading. A noise component added to a receiving side may be ignored. And, a single receiving antenna preferably exists. In this case, spread sequences obtained by a receiving side after completion of SFBC decoding and FSTD decoding can be represented as in Equation 3.

  • (h1|2+|h2|2)·(a1+b1+c1+d1),

  • (h1|2+|h2|2)·(a2+b2+c2+d2),

  • (h3|2+|h4|2)·(a3+b3+c3+d3),

  • (h3|2+|h4|2)·(a4+b4+c4+d4),  [Equation 3]
  • Here, in order to separate the spread sequence obtained by the receiving side from the signals b, c and d by despreading with a (pseudo) orthogonal code corresponding to the signal a for example, the wireless channel responses for the four chips is preferably the same. However, as can be observed from Equation 3, signals transmitted via different antenna sets by FSTD are (h1|2+|h2|2) and (h3|2+|h4|2) and provide results through different wireless channel responses, respectively. Thus, complete elimination of a different CDM-multiplexed signal during dispreading is not performed.
  • Therefore, one embodiment of the present invention is directed to a method of transmitting at least one spread signal in a communication system, wherein each of at least one signal is spread by (pseudo) orthogonal code or the like with a spreading factor (SF), and wherein the at least one spread signal is multiplexed by CDM and transmitted via the same antenna set. FIG. 3 is a diagram illustrating an example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention. In the present embodiment, each of at least one signal is spread by (pseudo) orthogonal code or the like with SF=4. Furthermore, the at least one spread signal is multiplexed and transmitted by CDM, and the multiplexed signals are transmitted via the same antenna set.
  • In FIG. 3, when a total of four transmitting antennas are used, a first antenna set includes a first antenna and a second antenna. A second antenna set includes a third antenna and a fourth antenna. In particular, each of the first and second antenna sets is the antenna set for performing SFBC coding, and an FSTD scheme is applicable between the two antenna sets. According to the present embodiment, assuming that data to be transmitted is carried by a single OFDM symbol, the signal spread with SF=4, as shown in FIG. 3, can be transmitted via four neighbor subcarriers of one OFDM symbol via the same SFBC-coded antenna set.
  • In FIG. 3( a), shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set. In FIG. 3( b), shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • FIG. 4 is a diagram illustrating another example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention. In the present embodiment, like the former embodiment shown in FIG. 3, each of at least one signal is spread by (pseudo) orthogonal code or the like with SF=4. The at least one spread signal is multiplexed and transmitted by CDM, and the multiplexed signals are transmitted via the same antenna set.
  • In FIG. 4, unlike FIG. 3, when a total of four transmitting antennas are used, a first antenna set includes a first antenna and a third antenna. A second antenna set includes a second antenna and a fourth antenna. Namely, compared to FIG. 3, FIG. 4 shows a case of using a different method for constructing each antenna set but applying the same SFBC/FSTD scheme. Here, according to the present embodiment, the signal spread with SF=4 can be transmitted via four neighbor subcarriers of one OFDM symbol via the same SFBC-coded antenna set.
  • In FIG. 4( a), shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set. In FIG. 4( b), shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • FIG. 5 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with an embodiment of the present invention. Preferably, a same signal can be repeatedly transmitted to obtain additional diversity. Accordingly, the present embodiment relates to a case where the same signal is repeatedly transmitted at least twice via different subcarriers on a frequency axis, i.e., for a period of the same time unit.
  • In the present embodiment, an antenna set is determined as follows. First, after a signal has been spread with SF=4, an antenna set is determined by a 4-subcarrier unit to enable the signal spread according to the aforesaid embodiment to be transmitted via the same antenna set. In this case, as mentioned in the foregoing description, the signal is repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity. According to the present embodiment, an antenna-frequency mapping structure, to which the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity gain is applied, may be repeated by an 8-subcarrier unit.
  • In FIG. 5( a), shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 3. In FIG. 5( b), shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 4. In particular, FIG. 5( a) and FIG. 5( b) show examples for applying the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity gain using eight neighbor subcarriers, respectively. Although FIG. 5( a) and FIG. 5( b) differ from each other with respect to the antennas included in the first and second antenna sets, each use the same method in applying the present embodiment.
  • In accordance with the present invention, a one-time transmission may correspond to a case where a signal having been spread with SF=4 is CDM-multiplexed and then transmitted via four subcarriers. Accordingly, assuming that one-time transmission is performed via the first antenna set shown in FIG. 5( a) or 5(b), a two-time transmission, which is the repetitive transmission of the one-time transmission, can be carried out via the second antenna set. Thus, it is observed that the SFBC/FSTD scheme is implemented via the one-time transmission and the two-time transmission. In the same manner, a three-time transmission may be carried out when the first antenna set performs the transmission again.
  • FIG. 6 is a diagram illustrating another example for a method of applying a SFBC/FSTD scheme to a spread signal in a communication system in accordance with an embodiment of the present invention. In FIG. 6, like the embodiment shown in FIG. 5, after a signal is spread with SF=4, an antenna set is determined by a 4-subcarrier unit to enable the signal spread according to the aforesaid embodiment to be transmitted via the same antenna set. In this case, as mentioned in the foregoing description, the signal is repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply SFBC/FSTD for obtaining 4-degree transmitting antenna diversity.
  • However, while the embodiments shown in FIG. 5 use the SFBC/FSTD scheme through eight neighbor subcarriers, the embodiment of FIG. 6 uses subcarriers having an interval compared to a previous transmission. Thus, frequency diversity may be obtained in addition to 4-degree antenna diversity. Notably, it is preferable that subcarriers through which a spread signal sequence is multiplexed and transmitted include subcarriers that neighbor each other.
  • This may be explained as follows. First, a one-time transmission may be performed using only four of eight subcarriers to which the SFBC/FSTD scheme is applied in the embodiment shown in FIG. 5 using a first antenna set. Subsequently, the one-time transmission is performed using four of eight subcarriers to which the SFBC/FSTD scheme is applied using a second antenna set. Accordingly, in order to implement the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity, an antenna set different from that of a previous transmission is used.
  • In FIG. 6( a), shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 3. In FIG. 6( b), shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 4. Although FIG. 6( a) and FIG. 6( b) differ from each other with respect to the antennas included in the first and second antenna sets, each use the same method in applying the present embodiment.
  • Referring to FIG. 6, compared to the method described in FIG. 5, the embodiment of FIG. 6 may considerably save resources required for the repetitive transmission by reducing additionally used resources in half. Therefore, if the repetitive transmission method according to FIG. 6 is applied, resources used for data transmission are used more efficiently.
  • As described above, a method of applying an SFBC/FSTD scheme for a single time unit according to an embodiment of the present invention was explained. However, situations occur where a signal may be transmitted using a plurality of time units, wherein a single OFDM symbol may be preferably defined as a time unit in a communication system adopting orthogonal frequency division multiplexing. Accordingly, in accordance with an embodiment of the present invention, a method of applying an SFBC/FSTD scheme to a case of transmitting a signal using a plurality of OFDM symbols will be explained.
  • When a signal is transmitted via a plurality of OFDM symbols, repetitive transmission on a time axis as well as a frequency axis is possible to obtain diversity additional to transmitting antenna diversity. Accordingly, CDM and SFBC/FSTD schemes may be applied to a spread signal for an ACK/NAK signal transmitted in downlink to announce the successful/failed reception of data transmitted in uplink.
  • FIG. 7 is a diagram illustrating an example of a method for transmitting a spread signal via a plurality of OFDM symbols in accordance with one embodiment of the present invention. Referring to FIG. 7, each small box indicates a resource element (RE) constructed with a single OFDM symbol and a single subcarrier. Aij; may indicate an ACK/NAK signal multiplexed by CDM, wherein “i” indicates an index of a signal spread and then multiplexed, and “j” indicates an ACK/NAK channel index of the multiplexed ACK/NAK signal. In this case, an ACK/NAK channel indicates a set of multiplexed ACK/NAK signals. A plurality of ACK/NAK channels may exist according to necessity and resource situation of each system. However, for clarity and convenience of description, a single ACK/NAK channel exists in FIG. 7.
  • In FIG. 7( a), shown is an example where a multiplexed ACK/NAK signal is transmitted via a single OFDM symbol. Referring to FIG. 7( a), four ACK/NAK signals are spread by a spreading factor equal to four (SF=4) for a single OFDM symbol, multiplexed by CDM, and then transmitted via four neighbor subcarriers. Because a single OFDM symbol is used for the ACK/NAK signal transmission, diversity gain on a time axis may not be obtained. However, four repetitive transmissions of the ACK/NAK signal multiplexed by CDM may be carried out along a frequency axis. Hence, the four-time repetitive transmission exemplifies repetition to obtain diversity. Notably, a repetition count may vary according to a channel status and/or a resource status of a system.
  • In FIG. 7( b), shown is an example where a multiplexed ACK/NAK signal is transmitted via a plurality of OFDM symbols. Referring to FIG. 7( b), four ACK/NAK signals are spread by a spreading factor SF=4 for two OFDM symbols each, multiplexed by CDM, and then transmitted via four neighbor subcarriers. Namely, in case that OFDM symbols for ACK/NAK signal transmission increase, the ACK/NAK signal may be repetitively transmitted using a single OFDM symbol for the increased OFDM symbols as it is. However, when the ACK/NAK signal is repetitively transmitted for a second OFDM symbol, transmission is performed to maximize use of subcarriers that are not overlapped with former subcarriers used for the first OFDM symbol. This is preferable considering a frequency diversity effect.
  • In FIG. 7( b), shown is a case where the number of ACK/NAK signals transmittable despite the increased number of OFDM symbols is equal to the case where a single OFDM symbol is used. Previously, an ACK/NAK signal was transmitted repeatedly only on a frequency axis when using a single OFDM symbol. However, in accordance with the present embodiment, more time-frequency resources may be used for transmitting the same number of ACK/NAK signals as in the single OFDM symbol case by substantially incrementing the repetition count of time-frequency. Here, because OFDM symbols used for the ACK/NAK transmission are increased, more signal power used for the ACK/NAK transmission can be allocated. Hence, the ACK/NAK signal may be transmitted to a cell having a wider area.
  • In FIG. 7( c), shown is another example where multiplexed ACK/NAK signals are transmitted via a plurality of OFDM symbols. Referring to FIG. 7( c), when the number of OFDM symbols for ACK/NAK signal transmission is set at 2, the transmission may be carried out by reducing the frequency-axis repetition count of the ACK/NAK signal multiplexed by CDM. Thus, by decreasing the repetition count to facilitate transmission when the number of OFDM symbols is set at 2, resources are efficiently utilized.
  • Compared with the transmission method shown in FIG. 7( b), four time-frequency axis transmission repetitions of the ACK/NAK signal are reduced to two transmission repetitions in FIG. 7( c). However, because the number of OFDM symbols used for the ACK/NAK signal transmission is incremented, the transmission method shown in FIG. 7( c) is similar to the method shown in FIG. 7( a), where a single OFDM symbol is used, because four time-frequency resource areas are available in both the methods shown in FIGS. 7( a) and 7(c).
  • Furthermore, compared to the transmission method shown in FIG. 7( b), the method shown in FIG. 7( c) may reduce the signal power for ACK/NAK channel transmission because the number of time-frequency resource areas used for a single ACK/NAK channel transmission is reduced. Moreover, because the ACK/NAK channel is transmitted across the time-frequency areas, per-symbol transmission power allocation may be performed more efficiently than transmission over a single OFDM symbol only.
  • In case that ACK/NAK signals are repetitively transmitted in the same structure for all OFDM symbols to simplify a system's scheduling operation, such as when the time-frequency resources shown in FIG. 7( b) are used for example, different ACK/NAK channels may be transmitted. In particular, because double ACK/NAK channels are transmittable, more efficient resource use is achieved.
  • As described above, a spreading factor for multiplexing a plurality of ACK/NAK signals, a repetition count in time-frequency domain and the number of OFDM symbols for ACK/NAK signal transmission, which are explained with reference to FIG. 7, are exemplarily provided for a more accurate description of the present invention. It is understood that different spreading factors, different repetition counts and various OFDM symbol numbers are applicable to the present invention. Moreover, the embodiments shown in FIG. 7 may relate to using a single transmitting antenna that does not use transmitting antenna diversity, but may also be applicable to a 2-transmitting antenna diversity method, 4-transmitting antenna diversity method, and the like.
  • FIG. 8 is a diagram illustrating an example of a method for transmitting spread signals via a plurality of OFDM symbols in accordance with one embodiment of the present invention, in which an SFBC/FSTD scheme is applied to the spread signal. Referring to FIG. 8, a 4-degree transmitting antenna diversity method using a total of four transmitting antennas is implemented. Here, a single ACK/NAK channel exists for clarity and convenience of description.
  • In FIG. 8( a), an SFBC/FSTD scheme is applied to a spread signal using four transmitting antennas, and the signal is transmitted for a plurality of OFDM symbols. Furthermore, four ACK/NAK signals are spread with a spreading factor SF=4 for each of two OFDM symbols, multiplexed by CDM, and then transmitted via four neighbor subcarriers. Preferably, when OFDM symbols for ACK/NAK signal transmission increase, the ACK/NAK signal may be repetitively transmitted using a single OFDM symbol for the increased OFDM symbols as it is. Notably, this process is similar to the process described with reference to FIG. 7( b).
  • However, when a repetitive transmission is performed for a second OFDM symbol, it is carried out using an antenna set different from an antenna set used for a first OFDM symbol. For example, if a transmission for a first OFDM symbol is performed using a first antenna set including a first antenna and a third antenna, a transmission for a second OFDM symbol can be performed using a second antenna set including a second antenna and a fourth antenna. Accordingly, the transmission for the second OFDM symbol is carried out by maximizing use of subcarriers not overlapped with former subcarriers used for the first OFDM symbol. This is preferable to achieve a frequency diversity effect.
  • In FIG. 8( b), shown is another example of applying an SFBC/FSTD scheme to a spread signal using four transmitting antennas and transmitting the signal for a plurality of OFDM symbols in accordance with one embodiment of the present invention. Referring to FIG. 8( b), when the number of OFDM symbols for ACK/NAK signal transmission is set to 2, the signal may be transmitted by reducing a frequency-axis repetition count of the ACK/NAK signal multiplexed by CDM. Notably, this process is similar to the method described with reference to FIG. 7( c). However, when repetitive transmission is carried out for a second OFDM symbol, the transmission will be performed using an antenna set different from the antenna set used for the first OFDM symbol.
  • FIG. 9 is a diagram illustrating an example for a method of applying an SFBC/FSTD scheme to a spread signal in a communication system in accordance with one embodiment of the present invention. Referring to FIG. 9, when a total of four transmitting antennas are used, a first antenna set includes a first antenna and second antenna, and a second antenna set includes a third antenna and fourth antenna. Preferably, each of the first and second antenna sets is an antenna set for performing SFBC coding and an FSTD scheme applicable between the two antenna sets. According to the present embodiment, if data is transmitted for a single OFDM symbol, the signal spread with SF=2, as shown in FIG. 9, can be transmitted via two neighbor subcarriers of one OFDM symbol via the same SFBC-coded antenna set.
  • In FIG. 9( a), shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set. In FIG. 9( b), shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • Accordingly, with regard to FIG. 9, a single signal may be spread with SF=2. Thus, the same structure as applying an SFBC/FSTD scheme by 4-subcarrier unit for a CDM-multiplexed signal may be used, but without considering spreading as in FIG. 1.
  • FIG. 10 is a diagram for illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention. In the embodiment shown in FIG. 10, like the former embodiment shown in FIG. 9, at least one or more signals are spread by (pseudo) orthogonal code or the like with SF=2. The at least one or more spread signals are also multiplexed and transmitted by CDM. Here, the multiplexed signals are transmitted via the same antenna set.
  • In FIG. 10, unlike FIG. 9, when a total of four transmitting antennas are used, a first antenna set includes a first antenna and third antenna, and a second antenna set includes a second antenna and fourth antenna. Thus, compared to FIG. 9, FIG. 10 illustrates use of a different method for constructing each antenna set but applies the same SFBC/FSTD scheme. In accordance with the present embodiment, the signal spread with SF=2 may be transmitted via two neighbor subcarriers of one OFDM symbol via the same SFBC-coded antenna set.
  • In FIG. 10( a), shown is a case where the spread signal transmitted via the first antenna set is different from the spread signal transmitted via the second antenna set. In FIG. 10( b), shown is a case where the spread signal transmitted via the first antenna set is repeatedly transmitted via the second antenna set to obtain a 4-degree transmitting antenna diversity gain.
  • Accordingly, with regard to FIG. 10, a single signal may be spread by SF=2. Thus, the same structure as applying SFBC/FSTD by 4-subcarrier unit for a CDM-multiplexed signal may be used without considering spreading as in FIG. 1.
  • FIG. 11 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention. In accordance with the present invention, a same signal can be repeatedly transmitted to obtain additional diversity. In particular, the same signal may be repeatedly transmitted at least once via different subcarriers on a frequency axis, i.e., for a period of the same time unit.
  • Referring to FIG. 11, an antenna set is determined as follows in accordance with the present invention. After a signal has been spread with SF=2, a plurality of the spread signals are multiplexed. An antenna set is then determined by 2-subcarrier unit to enable the spread signal to be transmitted via the same antenna set. In this case, the signal is repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply the SFBC/FSTD scheme for obtaining the 4-degree transmitting antenna diversity. Accordingly, an antenna-frequency mapping structure, to which the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity gain is applied, is repeated by 4-subcarrier unit.
  • In FIG. 11( a), shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 9. In FIG. 11( b), shown is an example where the repetitive transmission method is applied to the embodiment described with reference to FIG. 10. In particular, FIG. 11( a) and FIG. 11( b) illustrate examples for applying the SFBC/FSTD scheme using four neighbor subcarriers, respectively. Notably, FIGS. 11( a) and 11(b) differ from each other with respect to the antennas included in the first and second antenna sets, but use the same method in applying the described embodiment.
  • FIG. 12 is a diagram illustrating another example of a method for applying an SFBC/FSTD scheme to spread signals in a communication system in accordance with one embodiment of the present invention. In FIG. 12, like the embodiment shown in FIG. 11, after a plurality of signals spread with SF=2 have been multiplexed, an antenna set is determined by 2-subcarrier unit to enable the spread signals to be transmitted via the same antenna set. Here, the signal may be repeatedly transmitted by changing an antenna set in case of repetitive transmission to apply the SFBC/FSTD scheme for obtaining the 4-degree transmitting antenna diversity.
  • However, unlike the embodiment shown in FIG. 11 wherein the SFBC/FSTD scheme is applied through the four neighbor subcarriers, the embodiment of FIG. 12 uses a subcarrier having a prescribed interval by comparing a subcarrier used for repetitive transmission to that of a previous transmission. Notably, it is preferable that subcarriers through which a spread signal sequence is multiplexed and transmitted include subcarriers that neighbor each other.
  • In FIG. 12( a), shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 9. In FIG. 12( b), shown is an example where a repetitive transmission method is applied to the embodiment described with reference to FIG. 10. Notably, FIGS. 12( a) and 12(b) differ from each other with respect to the antennas included in the first and second antenna sets but use the same method in applying the described embodiment.
  • Accordingly, the embodiment of FIG. 12 may be described as follows. First, a one-time transmission is first performed using two of four subcarriers to which an SFBC/FSTD scheme is applied. The one-time transmission is then carried out using two of four subcarriers to which a next SFBC/FSTD scheme is applied. In this case, an antenna set different from that of a previous transmission is used to implement the SFBC/FSTD scheme.
  • FIG. 13 is a diagram illustrating an example of a method for applying an SFBC/FSTD scheme to at least one spread signal in a communication system in accordance with one embodiment of the present invention. Preferably, if an antenna-frequency mapping structure according to the SFBC/FSTD transmission scheme shown in FIG. 1 is maintained collectively for each OFDM symbol or subframe on a system, then the rest of an SFBC antenna set unused in the SFBC/FSTD scheme of FIG. 12 may be used for another data transmission.
  • Referring to FIG. 13, the same antenna-frequency mapping structure in the SFBC/FSTD scheme for obtaining 4-degree transmitting antenna diversity gain by the 4-subcarrier unit (described with reference to FIG. 1) is used. Accordingly, two different multiplexed signals may be transmitted using this structure. Here, each of the multiplexed signals is a multiplexed signal spread by SF=2, and can be transmitted through two subcarriers.
  • As applied, in the SFBC/FSTD transmission scheme for transmitting a random multiplexed signal generated from multiplexing a plurality of spread data signals, a second antenna set other than a first antenna set to be SFBC-coded can be used to transmit another multiplexed signal. Moreover, by repeatedly transmitting the multiplexed signals via the first and second antenna sets, the multiplexed signals may respectively be transmitted through the different antenna sets. Hence, a 4-degree transmitting antenna diversity effect may be obtained.
  • For example, a first multiplexed signal is transmitted via first antenna set and a second multiplexed signal is transmitted via second antenna set. In case of a repetitive transmission, mapping between a multiplexed signal and an antenna is changed. Accordingly, the second multiplexed signal will be transmitted via the first antenna set, while the first multiplexed signal is transmitted via the second antenna set. In case of a next repetitive transmission, the mapping between the multiplexed signal and the antenna is changed again to perform the corresponding transmission. Thus, the first multiplexed signal will again be transmitted via first antenna set and the second multiplexed signal will again be transmitted via second antenna set. Accordingly, if transmission is performed in the above-mentioned manner, resources are efficiently used. Moreover, the antenna-frequency mapping structure in the SFBC/FSTD scheme described with reference to FIG. 1 will be maintained.
  • In the example above, the signal spread by SF=2 is transmitted via a single OFDM symbol only. If so, repetition on a frequency axis is possible to obtain additional frequency diversity. However, using a single OFDM symbol is merely exemplary for illustrating the present invention. As mentioned in the foregoing description of SF=4, the present embodiment is applicable to a case of using several OFDM symbols.
  • When transmitting via several OFDM symbols, repetition on a time axis as well as a frequency axis is applicable to obtain diversity in addition to transmitting antenna diversity. The above embodiments are provided to explain applications of the present invention and are also applicable to a system using an SFBC/FSTD transmission diversity method regardless of various spreading factors (SF), various OFDM symbols numbers and repetition counts on time and frequency axes.
  • FIG. 14 is a diagram illustrating an example of a method for transmitting a spread signal in a mobile communication system in accordance with one embodiment of the present invention. Referring to FIG. 14, a transmitting end spreads a signal using a plurality of spreading codes (S1402). The plurality of spreading codes have a spreading factor of 4. The transmitting end codes the spread signal for multiple antenna transmission (S1404). The transmitting end multiplexes the coded spread signal by code division multiplexing per each antenna (S1406). The transmitting end transmits the multiplexed signal via four neighboring frequency resources of one OFDM symbol of a first antenna set consisting of two antennas (S1408). The transmitting end transmits the same multiplexed signal via four neighboring frequency resources of one OFDM symbol of a second antenna set consisting of two antennas (S1410). The multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different OFDM symbols. The multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are separated from each other in a frequency domain.
  • FIG. 15 is a diagram illustrating an example of a method for receiving a spread signal in a mobile communication system in accordance with one embodiment of the present invention. Referring to FIG. 15, a receiving end receives multiplexed signal via four neighboring frequency resources of one OFDM symbol, the multiplexed signal being transmitted from a first antenna set consisting of two antennas of a transmitting end (S1502). The receiving end receives the same multiplexed signal via four neighboring frequency resources of one OFDM symbol, the same multiplexed signal being transmitted from a second antenna set consisting of two antennas of the transmitting end (S1504). The multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted from the transmitting end via respectively different OFDM symbols. The multiplexed signal is obtained at the transmitting end from a coded spread signal using code division multiplexing per each antenna. The coded spread signal is obtained at the transmitting end by coding a spread signal between the two antennas in the first antenna set and the second antenna set.
  • Embodiments of the present invention can be implemented by various means, e.g., hardware, firmware, software, and any combination thereof. In case of the implementation by hardware, a method of transmitting a spread signal in a communication system according to one embodiment of the present invention can be implemented by at least one of application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • In case of implementation by firmware or software, a method of transmitting a spread signal in a communication system according to one embodiment of the present invention can be implemented by a module, procedure, function and the like capable of performing the above mentioned functions or operations. Software code is stored in a memory unit and can be driven by a processor. The memory unit is provided within or outside the processor to exchange data with the processor by various means known in public.
  • The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. The present teaching can be readily applied to other types of apparatuses. The description of the present invention is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. In the claims, means-plus-function clauses are intended to cover the structure described herein as performing the recited function and not only structural equivalents but also equivalent structures.

Claims (29)

1-20. (canceled)
21. A method for transmitting Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method comprising:
spreading the ACK/NACK information using an orthogonal sequence with a spreading factor of 4; and
transmitting first spread ACK/NACK information on four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol via multiple antennas,
wherein the first spread ACK/NACK information exists on the four available neighboring subcarriers of the multiple antennas in a form as shown in Table 1 or 2:
TABLE 1 First set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
TABLE 2 Second set of four available neighboring subcarriers in an OFDM symbol antenna A 0 0 0 0 antenna B 0 0 0 0 antenna C a1 a2 a3 a4 antenna D −a2* a1* −a4* a3*
wherein antennas A and B represent two antennas in the multiple antennas and antennas C and D represent two other antennas in the multiple antennas,
wherein a1 to a4 are associated with elements of the spread ACK/NACK information.
22. The method of claim 21, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers exist on different OFDM symbols.
23. The method of claim 21, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are not contiguous in a frequency domain.
24. The method of claim 21, further comprising transmitting second spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol via the multiple antennas,
wherein the first spread ACK/NACK information is transmitted on the first set of four available neighboring subcarriers in the form as shown in Table 1,
wherein the second spread ACK/NACK information is transmitted on the second set of four available neighboring subcarriers in the form as shown in Table 2, and
wherein the first spread ACK/NACK information and the second spread ACK/NACK information carry the same ACK/NACK information.
25. The method of claim 24, further comprising transmitting third spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol via the multiple antennas,
wherein the third spread ACK/NACK information is transmitted on a third set of four available neighboring subcarriers in a form as shown in Table 3, and
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry the same ACK/NACK information:
TABLE 3 Third set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
26. The method of claim 21, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.
27. The method of claim 21, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.
28. A method for receiving Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method comprising:
receiving first spread ACK/NACK information on four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information being transmitted from a transmitting end via multiple antennas,
wherein the first spread ACK/NACK information originates from spread of the ACK/NACK information using an orthogonal sequence with a spreading factor of 4,
wherein the first spread ACK/NACK information exists on the four available neighboring subcarriers of the multiple antennas in a form as shown in Table 1 or 2:
TABLE 1 First set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
TABLE 2 Second set of four available neighboring subcarriers in an OFDM symbol antenna A 0 0 0 0 antenna B 0 0 0 0 antenna C a1 a2 a3 a4 antenna D −a2* a1* −a4* a3*
wherein antennas A and B represent two antennas in the multiple antennas and antennas C and D represent two other antennas in the multiple antennas,
wherein a1 to a4 are associated with elements of the spread ACK/NACK information.
29. The method of claim 28, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers exist on different OFDM symbols.
30. The method of claim 28, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are not contiguous in a frequency domain.
31. The method of claim 28, further comprising receiving second spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol, the second spread ACK/NACK information being transmitted from the transmitting end via the multiple antennas,
wherein the first spread ACK/NACK information is received on the first set of four available neighboring subcarriers in the form as shown in Table 1,
wherein the second spread ACK/NACK information is received on the second set of four available neighboring subcarriers in the form as shown in Table 2, and
wherein the first spread ACK/NACK information and the second spread ACK/NACK information carry the same ACK/NACK information.
32. The method of claim 31, further comprising receiving third spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol, the third spread ACK/NACK information being transmitted from the transmitting end via the multiple antennas,
wherein the third spread ACK/NACK information is received on a third set of available neighboring subcarriers in a form as shown in Table 3, and
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry the same ACK/NACK information:
TABLE 3 Third set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
33. The method of claim 28, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.
34. The method of claim 28, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.
35. An apparatus configured to transmit Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the apparatus comprising:
a radio frequency unit; and
a processor,
wherein the processor is configured to spread the ACK/NACK information using an orthogonal sequence with a spreading factor of 4, and to transmit first spread ACK/NACK information on four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol via multiple antennas,
wherein the first spread ACK/NACK information exists on the four available neighboring subcarriers of the multiple antennas in a form as shown in Table 1 or 2:
TABLE 1 First set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
TABLE 2 Second set of four available neighboring subcarriers in an OFDM symbol antenna A 0 0 0 0 antenna B 0 0 0 0 antenna C a1 a2 a3 a4 antenna D −a2* a1* −a4* a3*
wherein antennas A and B represent two antennas in the multiple antennas and antennas C and D represent two other antennas in the multiple antennas,
wherein a1 to a4 are associated with elements of the spread ACK/NACK information.
36. The apparatus of claim 35, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers exist on different OFDM symbols.
37. The apparatus of claim 35, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are not contiguous in a frequency domain.
38. The apparatus of claim 35, wherein the processor is further configured to transmit second spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol via the multiple antennas,
wherein the first spread ACK/NACK information is transmitted on the first set of four available neighboring subcarriers in the form as shown in Table 1,
wherein the second spread ACK/NACK information is transmitted on the second set of four available neighboring subcarriers in the form as shown in Table 2, and
wherein the first spread ACK/NACK information and the second spread ACK/NACK information carry the same ACK/NACK information.
39. The apparatus of claim 38, wherein the processor is further configured to transmit third spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol via the multiple antennas,
wherein the third spread ACK/NACK information is transmitted on a third set of four available neighboring subcarriers in a form as shown in Table 3, and
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry the same ACK/NACK information:
TABLE 3 Third set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
40. The apparatus of claim 35, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.
41. The apparatus of claim 35, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.
42. An apparatus configured to receive Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the apparatus comprising:
a radio frequency unit; and
a processor,
wherein the processor is configured to receive first spread ACK/NACK information on four available neighboring subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information being transmitted from a transmitting end via multiple antennas,
wherein the first spread ACK/NACK information originates from spread of the ACK/NACK information using an orthogonal sequence with a spreading factor of 4,
wherein the first spread ACK/NACK information exists on the four available neighboring subcarriers of the multiple antennas in a form as shown in Table 1 or 2:
TABLE 1 First set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
TABLE 2 Second set of four available neighboring subcarriers in an OFDM symbol antenna A 0 0 0 0 antenna B 0 0 0 0 antenna C a1 a2 a3 a4 antenna D −a2* a1* −a4* a3*
wherein antennas A and B represent two antennas in the multiple antennas and antennas C and D represent two other antennas in the multiple antennas,
wherein a1 to a4 are associated with elements of the spread ACK/NACK information.
43. The apparatus of claim 42, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers exist on different OFDM symbols.
44. The apparatus of claim 42, wherein the first set of four available neighboring subcarriers and the second set of four available neighboring subcarriers are not contiguous in a frequency domain.
45. The apparatus of claim 42, wherein the processor is further configured to receive second spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol, the second spread ACK/NACK information being transmitted from the transmitting end via the multiple antennas,
wherein the first spread ACK/NACK information is received on the first set of four available neighboring subcarriers in the form as shown in Table 1,
wherein the second spread ACK/NACK information is received on the second set of four available neighboring subcarriers in the form as shown in Table 2, and
wherein the first spread ACK/NACK information and the second spread ACK/NACK information carry the same ACK/NACK information.
46. The apparatus of claim 45, wherein the processor is further configured to receive third spread ACK/NACK information on four available neighboring subcarriers in an OFDM symbol, the third spread ACK/NACK information being transmitted from the transmitting end via the multiple antennas,
wherein the third spread ACK/NACK information is received on a third set of four available neighboring subcarriers in a form as shown in Table 3, and
wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry the same ACK/NACK information:
TABLE 3 Third set of four available neighboring subcarriers in an OFDM symbol antenna A a1 a2 a3 a4 antenna B −a2* a1* −a4* a3* antenna C 0 0 0 0 antenna D 0 0 0 0
47. The apparatus of claim 42, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.
48. The apparatus of claim 42, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.
US13/045,455 2007-06-13 2011-03-10 Transmitting spread signal in communication system Active US8774297B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/045,455 US8774297B2 (en) 2007-06-13 2011-03-10 Transmitting spread signal in communication system
US13/162,487 US8792570B2 (en) 2007-06-13 2011-06-16 Transmitting spread signal in communication system
US13/757,695 US8774299B2 (en) 2007-06-13 2013-02-01 Transmitting spread signal in communication system
US14/303,482 US10742256B2 (en) 2007-06-13 2014-06-12 Transmitting spread signal in communication system

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US94378307P 2007-06-13 2007-06-13
US95501907P 2007-08-09 2007-08-09
US97648707P 2007-10-01 2007-10-01
US98243507P 2007-10-25 2007-10-25
US98323407P 2007-10-29 2007-10-29
KR1020070122986A KR100913090B1 (en) 2007-06-13 2007-11-29 A method for transmitting spread-signal in a communication system
KR10-2007-122986 2007-11-29
US12/139,254 US7953169B2 (en) 2007-06-13 2008-06-13 Transmitting spread signal in communication system
US13/045,455 US8774297B2 (en) 2007-06-13 2011-03-10 Transmitting spread signal in communication system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US12/139,254 Continuation US7953169B2 (en) 2007-06-13 2008-06-13 Transmitting spread signal in communication system

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/162,487 Continuation US8792570B2 (en) 2007-06-13 2011-06-16 Transmitting spread signal in communication system
US13/757,695 Continuation US8774299B2 (en) 2007-06-13 2013-02-01 Transmitting spread signal in communication system

Publications (2)

Publication Number Publication Date
US20110158292A1 true US20110158292A1 (en) 2011-06-30
US8774297B2 US8774297B2 (en) 2014-07-08

Family

ID=40368872

Family Applications (5)

Application Number Title Priority Date Filing Date
US12/139,254 Active 2028-11-27 US7953169B2 (en) 2007-06-13 2008-06-13 Transmitting spread signal in communication system
US13/045,455 Active US8774297B2 (en) 2007-06-13 2011-03-10 Transmitting spread signal in communication system
US13/162,487 Active US8792570B2 (en) 2007-06-13 2011-06-16 Transmitting spread signal in communication system
US13/757,695 Active US8774299B2 (en) 2007-06-13 2013-02-01 Transmitting spread signal in communication system
US14/303,482 Active 2030-01-24 US10742256B2 (en) 2007-06-13 2014-06-12 Transmitting spread signal in communication system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US12/139,254 Active 2028-11-27 US7953169B2 (en) 2007-06-13 2008-06-13 Transmitting spread signal in communication system

Family Applications After (3)

Application Number Title Priority Date Filing Date
US13/162,487 Active US8792570B2 (en) 2007-06-13 2011-06-16 Transmitting spread signal in communication system
US13/757,695 Active US8774299B2 (en) 2007-06-13 2013-02-01 Transmitting spread signal in communication system
US14/303,482 Active 2030-01-24 US10742256B2 (en) 2007-06-13 2014-06-12 Transmitting spread signal in communication system

Country Status (13)

Country Link
US (5) US7953169B2 (en)
EP (2) EP2171878B1 (en)
JP (1) JP5134082B2 (en)
KR (1) KR100913090B1 (en)
CN (2) CN101809887B (en)
AU (1) AU2008262770B2 (en)
BR (1) BRPI0812556B1 (en)
CA (1) CA2694694C (en)
ES (2) ES2700939T3 (en)
GB (1) GB2463211B (en)
MX (1) MX2009013555A (en)
TW (1) TWI367007B (en)
WO (1) WO2008153331A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8774299B2 (en) 2007-06-13 2014-07-08 Lg Electronics Inc. Transmitting spread signal in communication system
CN109981511A (en) * 2017-12-27 2019-07-05 华为技术有限公司 Data transmission based on non-orthogonal multiple

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101627567B (en) 2006-10-02 2014-07-02 Lg电子株式会社 Method for transmitting control signal using efficient multiplexing
MX2009003608A (en) 2006-10-02 2009-04-22 Lg Electronics Inc Method for transmitting downlink control signal.
CN104639306B (en) 2007-03-19 2019-04-16 Lg电子株式会社 The method that resources in mobile communication system distributes and transmits/receives resource allocation information
KR101049138B1 (en) 2007-03-19 2011-07-15 엘지전자 주식회사 In a mobile communication system, an acknowledgment signal receiving method
KR100908063B1 (en) 2007-06-13 2009-07-15 엘지전자 주식회사 Method of transmitting a spread signal in a mobile communication system
KR100900289B1 (en) 2007-06-21 2009-05-29 엘지전자 주식회사 A method for transmitting and receiving a control channel in the Orthogonal Frequency Division Multiplexing system
KR101410120B1 (en) 2007-08-21 2014-06-25 삼성전자주식회사 Apparatus and method for transmitting/receiving the hybrid- arq ack/nack signal in mobile communication system
JP5171271B2 (en) * 2008-01-08 2013-03-27 株式会社エヌ・ティ・ティ・ドコモ Mobile communication system, base station apparatus, user apparatus and method
EP3154300B1 (en) * 2008-12-08 2019-08-14 Wireless Future Technologies Inc. Uplink control signaling in cellular telecommunication system
US9647810B2 (en) * 2009-03-17 2017-05-09 Samsung Electronics Co., Ltd. Method and system for mapping pilot signals in multi-stream transmissions
US8917796B1 (en) * 2009-10-19 2014-12-23 Marvell International Ltd. Transmission-mode-aware rate matching in MIMO signal generation
US10389477B2 (en) 2015-03-15 2019-08-20 Qualcomm Incorporated Devices and methods for facilitating a non-orthogonal underlay in wireless communications systems
JP6501967B2 (en) * 2015-08-25 2019-04-17 華為技術有限公司Huawei Technologies Co.,Ltd. Data transmission method, related apparatus, and system
WO2017155320A1 (en) * 2016-03-09 2017-09-14 엘지전자 주식회사 Method for transmitting and receiving signals in v2x communication, and apparatus therefor
CN108781100B (en) * 2016-03-10 2021-06-22 华为技术有限公司 Transmission diversity method, equipment and system
CN107733592B (en) 2016-08-10 2020-11-27 华为技术有限公司 Transmission scheme indication method, data transmission method, device and system
CN106254294B (en) * 2016-10-13 2019-08-30 江苏中兴微通信息科技有限公司 The method that short packages ultra wide band is sent is realized in block code ofdm system
WO2018179433A1 (en) * 2017-03-31 2018-10-04 富士通株式会社 Wireless device, wireless system, and processing method
CN110890955B (en) * 2018-09-06 2021-06-01 华为技术有限公司 Communication method and device

Citations (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870391A (en) * 1996-03-25 1999-02-09 Canon Kabushiki Kaisha Wireless communication system using frequency hopping, and method of controlling the system
US20010005681A1 (en) * 1999-12-13 2001-06-28 Kyou-Woong Kim Method for controlling paging alert tone of a mobile station in a mobile communication system
US20010034236A1 (en) * 2000-01-18 2001-10-25 Wen Tong Multi-beam antenna system for high speed data
US6452936B1 (en) * 1997-11-17 2002-09-17 Oki Electric Industry Co., Ltd. Spread-spectrum communication apparatus with adaptive frame configuration
US20030039227A1 (en) * 2001-08-24 2003-02-27 Kwak Joseph A. Method for physical layer automatic repeat request for a base station
US20030133426A1 (en) * 2000-09-29 2003-07-17 Brett Schein Selecting random access channels
US20040009780A1 (en) * 2002-02-19 2004-01-15 Interdigital Technology Corporation Method and apparatus for providing a highly reliable ACK/NACK for time division duplex (TDD) and frequency division duplex (FDD)
US20040081131A1 (en) * 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US20040190640A1 (en) * 2003-02-28 2004-09-30 Nortel Networks Limited Sub-carrier allocation for OFDM
US6842487B1 (en) * 2000-09-22 2005-01-11 Telefonaktiebolaget Lm Ericsson (Publ) Cyclic delay diversity for mitigating intersymbol interference in OFDM systems
US20050083977A1 (en) * 2002-02-08 2005-04-21 Moulsley Timothy J. Radio communication system
US20050117536A1 (en) * 2003-10-23 2005-06-02 Samsung Electronics Co., Ltd. System and method for transmitting and receiving resource allocation information in a wireless communication system
US20050122898A1 (en) * 2003-11-05 2005-06-09 Samsung Electronics Co., Ltd. HARQ method for guaranteeing QoS in a wireless communication system
US20050165949A1 (en) * 2004-01-28 2005-07-28 Teague Edward H. Method and apparatus of using a single channel to provide acknowledgement and assignment messages
US6934318B2 (en) * 2000-12-22 2005-08-23 Qualcomm, Incorporated Method and system for energy based frame rate determination
US20050220000A1 (en) * 2004-04-02 2005-10-06 Lg Electronics Inc. Transmission method for downlink control signal in MIMO system
US20050232181A1 (en) * 2004-03-12 2005-10-20 Samsung Electronics Co., Ltd. Data transmission system in broadband wireless access system using band AMC and method thereof
US20050233754A1 (en) * 2003-08-20 2005-10-20 Beale Martin W Obtaining channel quality information in a wireless communication network
US20050286402A1 (en) * 2004-05-31 2005-12-29 Samsung Electronics Co., Ltd. Method and apparatus for transmitting uplink acknowledgement information in an OFDMA communication system
US20060013186A1 (en) * 2004-06-04 2006-01-19 Avneesh Agrawal Wireless communication system with improved broadcast coverage
US20060045001A1 (en) * 2004-08-25 2006-03-02 Ahmad Jalali Transmission of signaling in an OFDM-based system
US7069050B2 (en) * 2002-05-21 2006-06-27 Nec Corporation Antenna transmission and reception system
US20060198294A1 (en) * 2005-03-01 2006-09-07 Alcatel Method for OFDM data transmission in a single-frequency multi-cell mobile network with channel estimation by means of pilots subgrid, a base transceiver station, a base station controller, a mobile terminal and a mobile network therefor
US20060209814A1 (en) * 2004-02-17 2006-09-21 Samsung Electronics Co., Ltd. Radio transmission apparatus and method, radio reception apparatus and method, transmitting and receiving method, and recording medium
US20060250941A1 (en) * 2002-04-22 2006-11-09 Onggosanusi Eko N MIMO PGRC system and method
US20060264218A1 (en) * 2005-05-19 2006-11-23 Nortel Networks Limited Method and system for allocating media access control layer resources in a wireless communication environment
US20060274842A1 (en) * 2005-06-06 2006-12-07 Interdigital Technology Corporation Frequency domain joint detection for wireless communication systems
US20060280256A1 (en) * 2005-05-04 2006-12-14 Samsung Electronic Co.,Ltd. Method, apparatus, and system for transmitting and receiving information of an uncoded channel in an orthogonal frequency division multiplexing system
US20070064669A1 (en) * 2005-03-30 2007-03-22 Motorola, Inc. Method and apparatus for reducing round trip latency and overhead within a communication system
US20070097915A1 (en) * 2005-11-02 2007-05-03 Aris Papasakellariou Methods for Dimensioning the Control Channel for Transmission Efficiency in Communication Systems
US20070097981A1 (en) * 2005-11-02 2007-05-03 Aris Papasakellariou Methods for Determining the Location of Control Channels in the Uplink of Communication Systems
US20070097942A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US20070110104A1 (en) * 2005-08-24 2007-05-17 Sartori Philippe J Resource allocation in cellular communication systems
US20070149137A1 (en) * 2005-12-22 2007-06-28 Tom Richardson Methods and apparatus for communicating control information
US20070183533A1 (en) * 2006-02-08 2007-08-09 Schmidl Timothy M MIMO system with spatial diversity
US20070184849A1 (en) * 2006-01-20 2007-08-09 Act Technologies, Llc Systems and Methods for Satellite Forward Link Transmit Diversity Using Orthagonal Space Coding
US20070206559A1 (en) * 2006-02-11 2007-09-06 Samsung Electronics Co., Ltd. Method and apparatus for allocating transmission resources and signaling the allocated transmission resources for frequency diversity
US20070208986A1 (en) * 2006-02-06 2007-09-06 Qualcomm Incorporated Message remapping and encoding
US20070211667A1 (en) * 2005-10-27 2007-09-13 Avneesh Agrawal Assignment acknowledgement for a wireless communication system
US20070254662A1 (en) * 2006-04-28 2007-11-01 Samsung Electronics Co., Ltd. Apparatus and method for scheduling hybrid ARQ acknowledgment messages in a wireless network
US20070258540A1 (en) * 2006-05-08 2007-11-08 Motorola, Inc. Method and apparatus for providing downlink acknowledgments and transmit indicators in an orthogonal frequency division multiplexing communication system
US20070258373A1 (en) * 2006-05-08 2007-11-08 Frank Frederiksen Optimized signalling of scheduling decisions
US7315577B2 (en) * 2003-09-15 2008-01-01 Intel Corporation Multiple antenna systems and method using high-throughput space-frequency block codes
US20080025247A1 (en) * 2006-07-28 2008-01-31 Motorola, Inc. Indicating special transmissions in wireless communication systems
US20080025337A1 (en) * 2006-07-28 2008-01-31 Smith Jack A Apparatus and Method For Handling Control Channel Reception/Decoding Failure In A Wireless VoIP Communication System
US7336633B2 (en) * 2001-05-29 2008-02-26 Agere Systems Inc. Media access controller for high bandwidth communication media and method of operation thereof
US20080090528A1 (en) * 2006-07-07 2008-04-17 Malladi Durga P Method and apparatus for sending data and control information in a wireless communication system
US20080095106A1 (en) * 2006-07-24 2008-04-24 Malladi Durga P Variable control channel for a wireless communication system
US7386076B2 (en) * 2001-03-29 2008-06-10 Texas Instruments Incorporated Space time encoded wireless communication system with multipath resolution receivers
US20080227398A1 (en) * 2007-03-15 2008-09-18 Interdigital Technology Corporation Method and apparatus for feedback overhead reduction in wireless communications
US20080225791A1 (en) * 2007-03-13 2008-09-18 Zhouyue Pi Methods for transmitting multiple acknowledgments in single carrier fdma systems
US20080225784A1 (en) * 2007-03-14 2008-09-18 Li-Chih Tseng Method and Apparatus for Configuring a Transport Block Size in a Wireless Communications System
US20080232307A1 (en) * 2007-03-23 2008-09-25 Zhouyue Pi Method and apparatus to allocate resources for acknowledgments in communication systems
US20080253469A1 (en) * 2005-03-30 2008-10-16 Jianglei Ma Methods and Systems for Ofdm Using Code Division Multiplexing
US20080267158A1 (en) * 2007-04-26 2008-10-30 Jianzhong Zhang Transmit diversity for acknowledgement and category 0 bits in a wireless communication system
WO2008133439A1 (en) * 2007-04-26 2008-11-06 Samsung Electronics Co., Ltd. Transmit diversity in a wireless communication system
US20080304593A1 (en) * 2007-06-06 2008-12-11 Farooq Khan Transmission symbols mapping for antenna diversity
US20080310483A1 (en) * 2007-06-13 2008-12-18 Lg Electronics Inc. Transmitting spread signal in mobile communication system
US20090046793A1 (en) * 2007-08-16 2009-02-19 Motorola, Inc. Method and system for selective use of control channel element based implicit pointing
US20090060081A1 (en) * 2005-03-30 2009-03-05 Hang Zhang Systems and methods for ofdm channelization
US20090059884A1 (en) * 2007-08-03 2009-03-05 Jianzhong Zhang Transmission methods for downlink ACK/NACK channels
US20090154580A1 (en) * 2007-06-21 2009-06-18 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
US20090196279A1 (en) * 2006-10-18 2009-08-06 Electronics And Telecommunications Research Institute Tdm based cell search method for ofdm system
US20090274037A1 (en) * 2008-02-19 2009-11-05 Lg Electronics Inc. Method for mapping physical hybrid automatic repeat request indicator channel
US20090285163A1 (en) * 2005-12-08 2009-11-19 Hang Zhang Resource Assignment Systems and Methods
US20090310719A1 (en) * 2006-08-28 2009-12-17 Sony Deutschland Gmbh Equalizing structure and equalizing method
US20090323615A1 (en) * 2004-12-27 2009-12-31 Bin Chul Ihm Communicating non-coherent detectable signal in broadband wireless access system
US20100002754A1 (en) * 2007-06-13 2010-01-07 Lg Electronics Inc. Transmitting spread signal in communication system
US20100034163A1 (en) * 2008-08-11 2010-02-11 Qualcomm Incorporated Anchor carrier in a multiple carrier wireless communication system
US20100098005A1 (en) * 2007-03-19 2010-04-22 Lg Electronics Inc. Method for receiving ack/nack signal in mobile communication system
US20100260164A1 (en) * 2007-12-20 2010-10-14 Seong Ho Moon Method for transmitting data in wireless communication system
US20110002309A1 (en) * 2008-02-29 2011-01-06 Hyung Ho Park Method of transmitting ack/nack signal in wireless communication system
US7954032B2 (en) * 2005-06-17 2011-05-31 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving broadcast data in a mobile communication system
US7995661B2 (en) * 2007-08-13 2011-08-09 Sharp Laboratories Of America, Inc. Systems and methods for conserving the power supply of a communications device
US20120106478A1 (en) * 2010-11-02 2012-05-03 Lg Electronics Inc. Method and apparatus for transmitting control information in radio communication system
US20120113945A1 (en) * 2009-10-20 2012-05-10 Lg Electronics Inc. Method and apparatus for transmitting acknowledgement in wireless communication system
US20130294282A1 (en) * 2011-01-23 2013-11-07 Lg Electronics Inc. Method and apparatus for transmitting an uplink signal by a relay in a wireless communcation system

Family Cites Families (86)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0474026A (en) 1990-07-16 1992-03-09 Nippon Telegr & Teleph Corp <Ntt> Connection control method in mobile communication
GB2301751B (en) 1995-06-02 2000-02-09 Dsc Communications Control message transmission in telecommunications systems
JP3190859B2 (en) 1997-07-29 2001-07-23 松下電器産業株式会社 CDMA radio transmitting apparatus and CDMA radio receiving apparatus
EP0983646B1 (en) 1998-02-14 2003-06-04 Samsung Electronics Co., Ltd. Data communication device and method for mobile communication system with dedicated control channel
US6594473B1 (en) 1999-05-28 2003-07-15 Texas Instruments Incorporated Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities
KR20020009079A (en) 2000-07-24 2002-02-01 박종섭 Apparatus for controlling transmit diversity
US6985434B2 (en) 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
JP3426218B2 (en) 2001-01-19 2003-07-14 松下電器産業株式会社 Base station apparatus and encoding / modulation method
CA2380039C (en) 2001-04-03 2008-12-23 Samsung Electronics Co., Ltd. Method of transmitting control data in cdma mobile communication system
US6662024B2 (en) 2001-05-16 2003-12-09 Qualcomm Incorporated Method and apparatus for allocating downlink resources in a multiple-input multiple-output (MIMO) communication system
JP2004364321A (en) 2001-06-01 2004-12-24 Sony Corp Inverse spread apparatus, propagation line estimate apparatus, receiver and interference suppressing apparatus, inverse spread, propagation line estimate, reception and interference suppressing method, program for them, and recording medium with the program recorded thereon
RU2221335C2 (en) 2001-11-01 2004-01-10 Общество с ограниченной ответственностью "Алгоритм" Method for data transmission in wireless local-area network
CA2434123C (en) 2001-11-10 2007-06-12 Samsung Electronics Co., Ltd. Stfbc coding/decoding apparatus and method in an ofdm mobile communication system
JP2003198443A (en) 2001-12-26 2003-07-11 Matsushita Electric Ind Co Ltd Base station device, communication terminal device, and radio communication method
WO2003077579A1 (en) 2002-03-12 2003-09-18 Ascom Ag Radio resource allocation in a radio communication network
US6873831B2 (en) 2002-04-01 2005-03-29 Qualcomm Incorporated Method and apparatus for transmit power modulation in a wireless communications system
KR100837351B1 (en) 2002-04-06 2008-06-12 엘지전자 주식회사 Update method for radio link parameter of mobile communication system
DE60328148D1 (en) 2002-04-24 2009-08-13 Samsung Electronics Co Ltd Arrangement and method for supporting automatic repeat request in a high data rate packet data radio communication system
JP4532272B2 (en) 2002-08-19 2010-08-25 クゥアルコム・インコーポレイテッド Deboosting in the communication environment
US8213390B2 (en) 2002-10-24 2012-07-03 Qualcomm Incorporated Reverse link automatic repeat request
TW589818B (en) 2002-11-22 2004-06-01 Chung Shan Inst Of Science Method of transmit diversity using TDD wideband multi-carrier DS-CDMA system
US6882857B2 (en) 2002-11-26 2005-04-19 Qualcomm, Incorporated Method and apparatus for efficient processing of data for transmission in a communication system
JP4378967B2 (en) 2003-02-10 2009-12-09 日本電気株式会社 Mobile communication system, radio network control apparatus, and resource allocation control method used therefor
JP3860556B2 (en) 2003-04-04 2006-12-20 松下電器産業株式会社 Base station apparatus and communication method
WO2004095851A2 (en) 2003-04-23 2004-11-04 Flarion Technologies, Inc. Methods and apparatus of enhancing performance in wireless communication systems
KR20050000709A (en) 2003-06-24 2005-01-06 삼성전자주식회사 Apparatus and method for transmitting/receiving data according to channel states in communication systems using multiple access scheme
WO2005006250A1 (en) 2003-06-25 2005-01-20 Variance Dynamical, Inc. Apparatus and method for detecting and analyzing spectral components
CN100539482C (en) 2003-07-08 2009-09-09 上海贝尔阿尔卡特股份有限公司 The merging method and the receiver that mix automatic repeat requests in the ofdm system
JP2007504708A (en) 2003-08-29 2007-03-01 サムスン エレクトロニクス カンパニー リミテッド Apparatus and method for controlling the operating state of a medium access control hierarchy in a broadband wireless access communication system
WO2005050875A1 (en) 2003-11-19 2005-06-02 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving common control information in a wireless communication system
US9473269B2 (en) 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
WO2005060132A1 (en) 2003-12-18 2005-06-30 Electronics And Telecommunications Research Institute Method and apparatus for requesting and reporting channel quality information in mobile communication system
ATE429744T1 (en) 2003-12-19 2009-05-15 Panasonic Corp HARQ PROTOCOL WITH SYNCHRONOUS REPEATS
KR101009145B1 (en) 2004-01-09 2011-01-18 엘지전자 주식회사 Decision method for downlink ack/nack feedback signal at a terminal in soft-handover
EP1704664B1 (en) 2004-01-09 2013-10-23 LG Electronics Inc. Packet transmission method
JP3987858B2 (en) 2004-01-27 2007-10-10 株式会社エヌ・ティ・ティ・ドコモ Wireless communication system, wireless transmission device, wireless reception device, and wireless communication method
GB2411555A (en) 2004-02-27 2005-08-31 Toshiba Res Europ Ltd CDMA system with 2D spreading where the spreading codes/factors depend upon the number of active users
JP4432583B2 (en) 2004-03-31 2010-03-17 栗田工業株式会社 Ultrapure water production equipment
EP1658687B1 (en) 2004-04-07 2012-05-02 LG Electronics, Inc. Transmission method of downlink control signal for mimo system
US7417974B2 (en) 2004-04-14 2008-08-26 Broadcom Corporation Transmitting high rate data within a MIMO WLAN
US7539917B2 (en) 2004-06-02 2009-05-26 Nokia Corporation Acknowledgement signaling for automatic repeat request mechanisms in wireless networks
KR100754795B1 (en) * 2004-06-18 2007-09-03 삼성전자주식회사 Apparatus and method for encoding/decoding space frequency block code for orthogonal frequency division multiplexing system
US7940663B2 (en) 2004-07-20 2011-05-10 Qualcomm Incorporated Mitigating ACK/NACK errors in MIMO/SIC/HARQ
KR20060016600A (en) 2004-08-18 2006-02-22 삼성전자주식회사 Discretely indicating method of resource allocation information and load reducing method in indication of resource allocation information
JP2006166382A (en) 2004-12-10 2006-06-22 Samsung Yokohama Research Institute Co Ltd Wireless receiver, wireless communication system, channel estimation method and computer program
US8831115B2 (en) 2004-12-22 2014-09-09 Qualcomm Incorporated MC-CDMA multiplexing in an orthogonal uplink
AU2006204197B9 (en) 2005-01-07 2010-02-04 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving multiuser packet in a mobile communication system
KR100688120B1 (en) * 2005-01-07 2007-03-02 삼성전자주식회사 Apparatus and method for encoding space-time frequency block code in wireless communication system
JP4616030B2 (en) 2005-02-17 2011-01-19 三星電子株式会社 Wireless transmission device, wireless reception device, transmission / reception method, and computer program
CN101218770B (en) 2005-07-08 2015-07-15 富士通株式会社 Wireless resource distributing process, communication device
KR100703287B1 (en) 2005-07-20 2007-04-03 삼성전자주식회사 System and method for transmitting/receiving resource allocation information in a communication system
KR100651911B1 (en) 2005-07-21 2006-12-01 엘지전자 주식회사 Method and system for providing call-forwarding information in mobile communication network
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
KR101313785B1 (en) * 2005-10-28 2013-10-01 코닌클리케 필립스 일렉트로닉스 엔.브이. Multiple antenna transmission with variable diversity gain
KR100996023B1 (en) * 2005-10-31 2010-11-22 삼성전자주식회사 Apparatsu and method for transmitting/receiving of data in a multiple antenna communication system
WO2007078146A1 (en) 2006-01-06 2007-07-12 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving uplink signaling information in a single carrier fdma system
JP4373426B2 (en) 2006-01-18 2009-11-25 株式会社エヌ・ティ・ティ・ドコモ Transmitting apparatus and transmitting method
CN101005326B (en) 2006-01-18 2014-05-07 华为技术有限公司 Up resource distributing method and radio communication system
US8116267B2 (en) 2006-02-09 2012-02-14 Samsung Electronics Co., Ltd. Method and system for scheduling users based on user-determined ranks in a MIMO system
KR100894142B1 (en) 2006-02-15 2009-04-22 삼성전자주식회사 Method and apparatus for resource allocation in a ofdm system
TWI346473B (en) 2006-03-21 2011-08-01 Lg Electronics Inc Method of transmitting/receiving lte system information in a wireless communication system
KR100885476B1 (en) 2006-05-02 2009-02-24 한국전자통신연구원 Method for transmitting and receiving downlink scheduling information in OFDMA system
EP1855424B1 (en) 2006-05-12 2013-07-10 Panasonic Corporation Reservation of radio resources for users in a mobile communications system
US7916775B2 (en) 2006-06-16 2011-03-29 Lg Electronics Inc. Encoding uplink acknowledgments to downlink transmissions
GB2439367A (en) 2006-06-20 2007-12-27 Nec Corp Separate ACK/NACK channel from a control channel
DK2800435T3 (en) 2006-08-21 2017-05-08 Interdigital Tech Corp Dynamic resource allocation, scheduling and signaling for LTE variable data rates
JP4295300B2 (en) 2006-08-22 2009-07-15 株式会社エヌ・ティ・ティ・ドコモ Transmitting apparatus and transmitting method
US8103929B2 (en) 2006-09-11 2012-01-24 Samsung Electronics Co., Ltd. Apparatus and method for transmitting forward/reverse ACK/NACK in mobile communication system
US8571120B2 (en) 2006-09-22 2013-10-29 Texas Instruments Incorporated Transmission of acknowledge/not acknowledge (ACK/NACK) bits and their embedding in the reference signal
JP4940867B2 (en) 2006-09-29 2012-05-30 日本電気株式会社 Multiplexing method of control signal and reference signal, resource allocation method and base station in mobile communication system
KR101265634B1 (en) 2006-10-02 2013-05-22 엘지전자 주식회사 Method for controlling group in the mobile communication system
MX2009003608A (en) 2006-10-02 2009-04-22 Lg Electronics Inc Method for transmitting downlink control signal.
JP4601596B2 (en) 2006-10-03 2010-12-22 株式会社エヌ・ティ・ティ・ドコモ Base station apparatus and method
KR101050955B1 (en) 2006-10-04 2011-07-20 콸콤 인코포레이티드 Uplink ABC Transmission for SDMA in Wireless Communication Systems
KR101319877B1 (en) 2006-11-01 2013-10-18 엘지전자 주식회사 Method For Allocating Resource, And Method For Transmitting Resource Allocating Information
CN101809929B (en) 2007-01-04 2016-11-23 诺基亚技术有限公司 Distribution to the temporal frequency resource controlling channel
KR100975704B1 (en) 2007-01-10 2010-08-12 삼성전자주식회사 Method and apparatus for transmitting/receiving of ACK/NACK
US8169956B2 (en) 2007-01-26 2012-05-01 Qualcomm Incorporated Mapping uplink acknowledgement transmission based on downlink virtual resource blocks
JP5206921B2 (en) 2007-03-16 2013-06-12 日本電気株式会社 Resource allocation control method and apparatus in mobile radio system
KR101381095B1 (en) 2007-04-26 2014-04-02 삼성전자주식회사 Method and apparatus for transmitting and receiving ack/nack signal in wireless telecommunication system
US8254492B2 (en) * 2007-04-26 2012-08-28 Samsung Electronics Co., Ltd. Transmit diversity in a wireless communication system
US7885176B2 (en) 2007-06-01 2011-02-08 Samsung Electronics Co., Ltd. Methods and apparatus for mapping modulation symbols to resources in OFDM systems
KR100911304B1 (en) 2007-06-18 2009-08-11 엘지전자 주식회사 Method for transmitting data of radio bearer having priority in wirelss communication system
MX2009013860A (en) 2007-06-19 2010-03-01 Nokia Siemens Networks Oy Adaptive transport format uplink signaling for data-non-associated feedback control signals.
WO2009041785A2 (en) 2007-09-28 2009-04-02 Lg Electronics Inc. Method for detecting control information in wireless communication system
KR101132085B1 (en) 2008-01-28 2012-04-02 엘지전자 주식회사 Method for transmitting ACK/NACK signal in wireless communication system

Patent Citations (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870391A (en) * 1996-03-25 1999-02-09 Canon Kabushiki Kaisha Wireless communication system using frequency hopping, and method of controlling the system
US6452936B1 (en) * 1997-11-17 2002-09-17 Oki Electric Industry Co., Ltd. Spread-spectrum communication apparatus with adaptive frame configuration
US20010005681A1 (en) * 1999-12-13 2001-06-28 Kyou-Woong Kim Method for controlling paging alert tone of a mobile station in a mobile communication system
US20010034236A1 (en) * 2000-01-18 2001-10-25 Wen Tong Multi-beam antenna system for high speed data
US6842487B1 (en) * 2000-09-22 2005-01-11 Telefonaktiebolaget Lm Ericsson (Publ) Cyclic delay diversity for mitigating intersymbol interference in OFDM systems
US20030133426A1 (en) * 2000-09-29 2003-07-17 Brett Schein Selecting random access channels
US6934318B2 (en) * 2000-12-22 2005-08-23 Qualcomm, Incorporated Method and system for energy based frame rate determination
US7386076B2 (en) * 2001-03-29 2008-06-10 Texas Instruments Incorporated Space time encoded wireless communication system with multipath resolution receivers
US7336633B2 (en) * 2001-05-29 2008-02-26 Agere Systems Inc. Media access controller for high bandwidth communication media and method of operation thereof
US20030039227A1 (en) * 2001-08-24 2003-02-27 Kwak Joseph A. Method for physical layer automatic repeat request for a base station
US20050083977A1 (en) * 2002-02-08 2005-04-21 Moulsley Timothy J. Radio communication system
US20040009780A1 (en) * 2002-02-19 2004-01-15 Interdigital Technology Corporation Method and apparatus for providing a highly reliable ACK/NACK for time division duplex (TDD) and frequency division duplex (FDD)
US20060250941A1 (en) * 2002-04-22 2006-11-09 Onggosanusi Eko N MIMO PGRC system and method
US7069050B2 (en) * 2002-05-21 2006-06-27 Nec Corporation Antenna transmission and reception system
US20040081131A1 (en) * 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US20040190640A1 (en) * 2003-02-28 2004-09-30 Nortel Networks Limited Sub-carrier allocation for OFDM
US20050233754A1 (en) * 2003-08-20 2005-10-20 Beale Martin W Obtaining channel quality information in a wireless communication network
US7315577B2 (en) * 2003-09-15 2008-01-01 Intel Corporation Multiple antenna systems and method using high-throughput space-frequency block codes
US20050117536A1 (en) * 2003-10-23 2005-06-02 Samsung Electronics Co., Ltd. System and method for transmitting and receiving resource allocation information in a wireless communication system
US20050122898A1 (en) * 2003-11-05 2005-06-09 Samsung Electronics Co., Ltd. HARQ method for guaranteeing QoS in a wireless communication system
US20050165949A1 (en) * 2004-01-28 2005-07-28 Teague Edward H. Method and apparatus of using a single channel to provide acknowledgement and assignment messages
US20060209814A1 (en) * 2004-02-17 2006-09-21 Samsung Electronics Co., Ltd. Radio transmission apparatus and method, radio reception apparatus and method, transmitting and receiving method, and recording medium
US20050232181A1 (en) * 2004-03-12 2005-10-20 Samsung Electronics Co., Ltd. Data transmission system in broadband wireless access system using band AMC and method thereof
US20050220000A1 (en) * 2004-04-02 2005-10-06 Lg Electronics Inc. Transmission method for downlink control signal in MIMO system
US20050286402A1 (en) * 2004-05-31 2005-12-29 Samsung Electronics Co., Ltd. Method and apparatus for transmitting uplink acknowledgement information in an OFDMA communication system
US20060013186A1 (en) * 2004-06-04 2006-01-19 Avneesh Agrawal Wireless communication system with improved broadcast coverage
US20060045001A1 (en) * 2004-08-25 2006-03-02 Ahmad Jalali Transmission of signaling in an OFDM-based system
US20090323615A1 (en) * 2004-12-27 2009-12-31 Bin Chul Ihm Communicating non-coherent detectable signal in broadband wireless access system
US20060198294A1 (en) * 2005-03-01 2006-09-07 Alcatel Method for OFDM data transmission in a single-frequency multi-cell mobile network with channel estimation by means of pilots subgrid, a base transceiver station, a base station controller, a mobile terminal and a mobile network therefor
US20080253469A1 (en) * 2005-03-30 2008-10-16 Jianglei Ma Methods and Systems for Ofdm Using Code Division Multiplexing
US20090060081A1 (en) * 2005-03-30 2009-03-05 Hang Zhang Systems and methods for ofdm channelization
US20070064669A1 (en) * 2005-03-30 2007-03-22 Motorola, Inc. Method and apparatus for reducing round trip latency and overhead within a communication system
US20060280256A1 (en) * 2005-05-04 2006-12-14 Samsung Electronic Co.,Ltd. Method, apparatus, and system for transmitting and receiving information of an uncoded channel in an orthogonal frequency division multiplexing system
US20060264218A1 (en) * 2005-05-19 2006-11-23 Nortel Networks Limited Method and system for allocating media access control layer resources in a wireless communication environment
US20060274842A1 (en) * 2005-06-06 2006-12-07 Interdigital Technology Corporation Frequency domain joint detection for wireless communication systems
US7954032B2 (en) * 2005-06-17 2011-05-31 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving broadcast data in a mobile communication system
US20070110104A1 (en) * 2005-08-24 2007-05-17 Sartori Philippe J Resource allocation in cellular communication systems
US20070211667A1 (en) * 2005-10-27 2007-09-13 Avneesh Agrawal Assignment acknowledgement for a wireless communication system
US20070097942A1 (en) * 2005-10-27 2007-05-03 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US20070097915A1 (en) * 2005-11-02 2007-05-03 Aris Papasakellariou Methods for Dimensioning the Control Channel for Transmission Efficiency in Communication Systems
US20070097981A1 (en) * 2005-11-02 2007-05-03 Aris Papasakellariou Methods for Determining the Location of Control Channels in the Uplink of Communication Systems
US20090285163A1 (en) * 2005-12-08 2009-11-19 Hang Zhang Resource Assignment Systems and Methods
US20070149137A1 (en) * 2005-12-22 2007-06-28 Tom Richardson Methods and apparatus for communicating control information
US20070184849A1 (en) * 2006-01-20 2007-08-09 Act Technologies, Llc Systems and Methods for Satellite Forward Link Transmit Diversity Using Orthagonal Space Coding
US20070208986A1 (en) * 2006-02-06 2007-09-06 Qualcomm Incorporated Message remapping and encoding
US20070183533A1 (en) * 2006-02-08 2007-08-09 Schmidl Timothy M MIMO system with spatial diversity
US20070206559A1 (en) * 2006-02-11 2007-09-06 Samsung Electronics Co., Ltd. Method and apparatus for allocating transmission resources and signaling the allocated transmission resources for frequency diversity
US20070254662A1 (en) * 2006-04-28 2007-11-01 Samsung Electronics Co., Ltd. Apparatus and method for scheduling hybrid ARQ acknowledgment messages in a wireless network
US20070258540A1 (en) * 2006-05-08 2007-11-08 Motorola, Inc. Method and apparatus for providing downlink acknowledgments and transmit indicators in an orthogonal frequency division multiplexing communication system
US20070258373A1 (en) * 2006-05-08 2007-11-08 Frank Frederiksen Optimized signalling of scheduling decisions
US20080090528A1 (en) * 2006-07-07 2008-04-17 Malladi Durga P Method and apparatus for sending data and control information in a wireless communication system
US20080095106A1 (en) * 2006-07-24 2008-04-24 Malladi Durga P Variable control channel for a wireless communication system
US20080025337A1 (en) * 2006-07-28 2008-01-31 Smith Jack A Apparatus and Method For Handling Control Channel Reception/Decoding Failure In A Wireless VoIP Communication System
US20080025247A1 (en) * 2006-07-28 2008-01-31 Motorola, Inc. Indicating special transmissions in wireless communication systems
US20090310719A1 (en) * 2006-08-28 2009-12-17 Sony Deutschland Gmbh Equalizing structure and equalizing method
US20090196279A1 (en) * 2006-10-18 2009-08-06 Electronics And Telecommunications Research Institute Tdm based cell search method for ofdm system
US20080225791A1 (en) * 2007-03-13 2008-09-18 Zhouyue Pi Methods for transmitting multiple acknowledgments in single carrier fdma systems
US20080225784A1 (en) * 2007-03-14 2008-09-18 Li-Chih Tseng Method and Apparatus for Configuring a Transport Block Size in a Wireless Communications System
US20080227398A1 (en) * 2007-03-15 2008-09-18 Interdigital Technology Corporation Method and apparatus for feedback overhead reduction in wireless communications
US20100098005A1 (en) * 2007-03-19 2010-04-22 Lg Electronics Inc. Method for receiving ack/nack signal in mobile communication system
US20080232307A1 (en) * 2007-03-23 2008-09-25 Zhouyue Pi Method and apparatus to allocate resources for acknowledgments in communication systems
US20080267158A1 (en) * 2007-04-26 2008-10-30 Jianzhong Zhang Transmit diversity for acknowledgement and category 0 bits in a wireless communication system
WO2008133439A1 (en) * 2007-04-26 2008-11-06 Samsung Electronics Co., Ltd. Transmit diversity in a wireless communication system
US20080304593A1 (en) * 2007-06-06 2008-12-11 Farooq Khan Transmission symbols mapping for antenna diversity
US20080310483A1 (en) * 2007-06-13 2008-12-18 Lg Electronics Inc. Transmitting spread signal in mobile communication system
US20100002754A1 (en) * 2007-06-13 2010-01-07 Lg Electronics Inc. Transmitting spread signal in communication system
US20090154580A1 (en) * 2007-06-21 2009-06-18 Lg Electronics Inc. Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
US20090059884A1 (en) * 2007-08-03 2009-03-05 Jianzhong Zhang Transmission methods for downlink ACK/NACK channels
US7995661B2 (en) * 2007-08-13 2011-08-09 Sharp Laboratories Of America, Inc. Systems and methods for conserving the power supply of a communications device
US20090046793A1 (en) * 2007-08-16 2009-02-19 Motorola, Inc. Method and system for selective use of control channel element based implicit pointing
US20100260164A1 (en) * 2007-12-20 2010-10-14 Seong Ho Moon Method for transmitting data in wireless communication system
US20090274037A1 (en) * 2008-02-19 2009-11-05 Lg Electronics Inc. Method for mapping physical hybrid automatic repeat request indicator channel
US20110002309A1 (en) * 2008-02-29 2011-01-06 Hyung Ho Park Method of transmitting ack/nack signal in wireless communication system
US20100034163A1 (en) * 2008-08-11 2010-02-11 Qualcomm Incorporated Anchor carrier in a multiple carrier wireless communication system
US20120113945A1 (en) * 2009-10-20 2012-05-10 Lg Electronics Inc. Method and apparatus for transmitting acknowledgement in wireless communication system
US20120106478A1 (en) * 2010-11-02 2012-05-03 Lg Electronics Inc. Method and apparatus for transmitting control information in radio communication system
US20130294282A1 (en) * 2011-01-23 2013-11-07 Lg Electronics Inc. Method and apparatus for transmitting an uplink signal by a relay in a wireless communcation system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LG Electronics, "DL ACK/NACK structure", RI-072878, 3GPP TSG RAN WG1 #49bis, June 2007 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8774299B2 (en) 2007-06-13 2014-07-08 Lg Electronics Inc. Transmitting spread signal in communication system
US10742256B2 (en) 2007-06-13 2020-08-11 Lg Electronics Inc. Transmitting spread signal in communication system
CN109981511A (en) * 2017-12-27 2019-07-05 华为技术有限公司 Data transmission based on non-orthogonal multiple

Also Published As

Publication number Publication date
US8774299B2 (en) 2014-07-08
EP2171878A2 (en) 2010-04-07
CA2694694C (en) 2012-10-30
US8774297B2 (en) 2014-07-08
AU2008262770B2 (en) 2010-12-16
GB2463211B (en) 2012-11-21
US20110243198A1 (en) 2011-10-06
KR100913090B1 (en) 2009-08-21
GB2463211A (en) 2010-03-10
TWI367007B (en) 2012-06-21
WO2008153331A2 (en) 2008-12-18
CN101809887A (en) 2010-08-18
TW200910862A (en) 2009-03-01
GB201000405D0 (en) 2010-02-24
EP2171878A4 (en) 2010-12-01
EP2171878B1 (en) 2014-04-02
US20100002754A1 (en) 2010-01-07
US7953169B2 (en) 2011-05-31
JP5134082B2 (en) 2013-01-30
MX2009013555A (en) 2010-04-27
ES2700939T3 (en) 2019-02-20
JP2010531091A (en) 2010-09-16
CN101809887B (en) 2013-05-15
WO2008153331A3 (en) 2009-03-19
CN103220085B (en) 2016-02-17
AU2008262770A1 (en) 2008-12-18
US20130148697A1 (en) 2013-06-13
US10742256B2 (en) 2020-08-11
CA2694694A1 (en) 2008-12-18
BRPI0812556B1 (en) 2020-05-12
ES2472743T3 (en) 2014-07-03
KR20080109586A (en) 2008-12-17
EP2683094B1 (en) 2018-09-12
BRPI0812556A2 (en) 2017-05-16
US20140294049A1 (en) 2014-10-02
US8792570B2 (en) 2014-07-29
EP2683094A1 (en) 2014-01-08
CN103220085A (en) 2013-07-24

Similar Documents

Publication Publication Date Title
US8774299B2 (en) Transmitting spread signal in communication system
US9197392B2 (en) Transmitting spread signal in communication system
RU2446601C2 (en) Transmission of signal with extended spectrum in communications system

Legal Events

Date Code Title Description
AS Assignment

Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEE, JUNG HOON;KIM, KI JUN;ROH, DONG WOOK;AND OTHERS;REEL/FRAME:025936/0733

Effective date: 20080923

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551)

Year of fee payment: 4

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 8